Question 1

Who discovered the nucleus through scattering of alpha particles?

Accepted Answer

Rutherford

Answer

Dalton

Answer

Chadwick

Answer

Thomson

Question 2

Which scientist discovered the neutron by bombarding beryllium with alpha particles?

Accepted Answer

Chadwick

Answer

Crookes

Answer

Millikan

Answer

Dalton

Question 3

Which scientist demonstrated that atoms are made up of small particles called atoms that are indivisible?

Accepted Answer

Dalton

Answer

Thomson

Answer

Rutherford

Answer

Crookes

Question 4

Who passed electric current through air at low pressure in a vacuum tube, leading to the discovery of cathode rays?

Accepted Answer

Crookes

Answer

Rutherford

Answer

Dalton

Answer

Millikan

Question 5

What did Bohr see in his experiment with a hydrogen gas vial attached to electrodes instead of a continuous spectrum?

Accepted Answer

a series of narrow colored lines

Answer

a continuous spectrum

Answer

a single bright line

Answer

a rainbow spectrum

Question 6

What did Bohr propose about the energy levels of electrons in an atom?

Accepted Answer

Electrons in energy levels are quantised, fixed - definite value.

Answer

Energy levels are random

Answer

Energy levels are infinite

Answer

Energy levels are continuously changing

Question 7

What is unique about the emission line spectrum of each element?

Accepted Answer

Each element has a unique emission line spectrum

Answer

All elements have the same spectrum

Answer

Emission line spectrum is the same for all elements

Answer

Elements share emission lines

Question 8

What phenomena does the Atomic Absorption Spectrometry (AAS) explain?

Accepted Answer

how elements can emit their own light and absorb light too

Answer

how elements only emit light

Answer

why elements don't have emission spectrums

Answer

how elements only absorb light

Question 9

Why did scientists find missing lines in the continuous spectrum during AAS experiments?

Accepted Answer

Hydrogen gas absorbed some of the white light as it passed through the sample

Answer

The sample was too small

Answer

The experiment was flawed

Answer

Hydrogen gas emitted light

Question 10

What did scientists discover about the energy sub-levels in the emission line spectra?

Accepted Answer

Each energy level was made up of a number of sub-levels

Answer

Each energy level has one sub-level

Answer

Energy levels are independent

Answer

Energy levels are continuous

Question 11

What did De Broglie find about the nature of moving electrons?

Accepted Answer

all moving electrons move in a wave motion

Answer

all moving electrons are particles

Answer

all moving electrons are stationary

Answer

all moving electrons move linearly

Question 12

What is the definition of atomic radius?

Accepted Answer

half the distance between the nuclei of two atoms of the same element that are joined together by a single covalent bond

Answer

the number of protons in an atom

Answer

the mass of an atom

Answer

the distance between the nucleus and the electron cloud

Question 13

What is the definition of ionisation energy?

Accepted Answer

The minimum energy required to completely remove the most loosely bound electron from a neutral gaseous atom in its ground state

Answer

The total energy of an atom

Answer

The force between electrons and protons

Answer

The energy released in a chemical reaction

Question 14

Why does first ionisation energy decrease as you go down a group?

Accepted Answer

Increasing atomic radius

Answer

Decreasing atomic radius

Answer

Increase in effective nuclear charge

Answer

No change in atomic properties

Question 15

What is electronegativity?

Accepted Answer

The relative force of attraction that an atom in a molecule has for the shared pair of electrons in a covalent bond

Answer

The total energy of an atom

Answer

The size of an atom

Answer

The number of electrons in an atom

Question 16

Why does electronegativity increase as you go across a period?

Accepted Answer

Increase in effective nuclear charge

Answer

Increasing atomic radius

Answer

No change in atomic properties

Answer

Screening effect of inner electrons

Question 17

What characterizes alkali metals?

Accepted Answer

Very reactive

Answer

High electronegativity

Answer

Metalloids

Answer

Non-reactive

Question 18

What does the second ionisation energy refer to?

Accepted Answer

The energy required to remove an electron from an ion with a positive charge in the gaseous state.

Answer

The energy required to add an electron to a neutral atom.

Answer

The energy required to remove an electron from an ion with a negative charge.

Answer

The energy required to remove an electron from a neutral atom.

Question 19

Which type of radiation is emitted from the nucleus and consists of 2 protons and 2 neutrons?

Accepted Answer

Alpha (α) radiation

Answer

Beta (β) radiation

Answer

Electromagnetic Radiation

Answer

Gamma (γ) radiation

Question 20

What is the definition of transmutation?

Accepted Answer

Changing of one element into another

Answer

Chemical reaction

Answer

Formation of isotopes

Answer

Emission of radiation

Question 21

What is the half life of a radioactive sample?

Accepted Answer

The time taken for half of the nuclei to decay

Answer

The time taken for the sample to emit gamma rays

Answer

The time taken for the sample to become non-radioactive

Answer

The time taken for all the nuclei to decay

Question 22

What type of radiation is commonly used in cancer treatment?

Accepted Answer

Cobalt-60

Answer

Beta (β) radiation

Answer

Americium-241

Answer

Carbon-14

Question 23

What happens to the atomic number during a beta nuclear reaction?

Accepted Answer

Increase by 1

Answer

Decrease by 1

Answer

Remains the same

Answer

Increase by 2

Question 24

What is emitted from the nucleus in a nuclear reaction?

Accepted Answer

Radiation

Answer

Neutrons

Answer

Electrons

Answer

Protons

Question 25

What is the main use of radioisotopes in the medical field?

Accepted Answer

Penetrate the body to kill cancerous cells

Answer

Prevent infections

Answer

Increase the body's immune system

Answer

Create new organs

Question 26

How are radioisotopes used in archaeological studies?

Accepted Answer

Determining the age of objects

Answer

Preserving artifacts

Answer

Identifying materials

Answer

Creating ancient structures

Question 27

Which state of an atom has the electron occupying the lowest energy level?

Accepted Answer

Ground state

Answer

Excited state

Answer

Top state

Answer

Neutral state

Question 28

What happens in the excited state of an atom?

Accepted Answer

Electron occupies higher energy levels

Answer

Atom becomes smaller

Answer

Electron disappears

Answer

Electron occupies same energy level

Question 29

What is it impossible to measure simultaneously according to Heisenberg's Uncertainty Principle?

Accepted Answer

Velocity and position of an electron

Answer

Spin and energy of an electron

Answer

Color and shape of an electron

Answer

Charge and mass of an electron

Question 30

What is an atomic orbital?

Accepted Answer

A region of space around the nucleus of an atom where there is a high possibility of finding an electron

Answer

A type of chemical bond between atoms

Answer

A subatomic particle in the nucleus of an atom

Answer

A form of energy released during nuclear reactions

Question 31

How many electrons can occupy an s orbital?

Accepted Answer

2

Answer

4

Answer

6

Answer

8

Question 32

Which atomic orbital has a dumbbell shape?

Accepted Answer

p orbital

Answer

s orbital

Answer

d orbital

Answer

f orbital

Question 33

How would you define an energy sublevel?

Accepted Answer

A group of atomic orbitals within an atom with the same energy

Answer

A group of atoms with different energies

Answer

A group of electrons with different energies

Answer

A group of molecules with different energies

Question 34

What type of bond involves the head-on overlap of orbitals?

Accepted Answer

Sigma Bond

Answer

Pi Bond

Answer

Ionic Bond

Answer

Covalent Bond

Question 35

Which type of bond involves the sideways overlap of orbitals?

Accepted Answer

Pi Bond

Answer

Ionic Bond

Answer

Metallic Bond

Answer

Hydrogen Bond

Question 36

According to the Aufbau Principle, how are electron energy levels filled?

Accepted Answer

Fill the lowest vacant energy levels first

Answer

Fill the highest energy levels first

Answer

Fill the odd-numbered energy levels first

Answer

Fill the middle energy levels first

Question 37

What is the maximum number of electrons that can occupy an orbital according to the Pauli Exclusion Principle?

Accepted Answer

2

Answer

3

Answer

4

Answer

1

Question 38

According to Hund's Rule, how do electrons occupy sublevels of equal energy?

Accepted Answer

Singly before filling them in pairs

Answer

Fill them in reverse order

Answer

Fill them randomly

Answer

Fill them in pairs first

Question 39

According to the Pauli Exclusion Principle, can two electrons in the same orbital have the same spin?

Accepted Answer

No

Answer

It depends

Answer

Maybe

Answer

Yes

Question 40

What shape does a water molecule have?

Accepted Answer

V-shaped

Answer

Tetrahedral

Answer

Trigonal pyramidal

Answer

Linear

Question 41

What causes the bond angle of a water molecule to be reduced from 109.5° to 104.5°?

Accepted Answer

Repulsion between the two lone pairs of electrons

Answer

Presence of oxygen atom

Answer

Attraction between hydrogen atoms

Answer

External magnetic field

Question 42

What is the shape of the ammonia (NH3) molecule?

Accepted Answer

Pyramidal

Answer

Linear

Answer

Trigonal Planar

Answer

Tetrahedral

Question 43

What does a covalent bond consist of?

Accepted Answer

A shared pair of electrons

Answer

A single proton

Answer

A shared pair of protons

Answer

Two separate electrons

Answer

A positive ion

Question 44

What does the Valence Shell Electron Pair Repulsion (VSEPR) Theory determine?

Accepted Answer

Shape of a molecule

Answer

Size of a molecule

Answer

State of a molecule

Answer

Color of a molecule

Question 45

What causes molecules to have a linear shape?

Accepted Answer

The repulsion between negatively charged electrons.

Answer

The presence of multiple covalent bonds.

Answer

The attraction between positively charged protons.

Answer

The interaction with external magnetic fields.

Question 46

Which of the following is NOT a factor that determines molecular shape?

Accepted Answer

The mass of the atoms in the molecule.

Answer

The repulsion between electron pairs.

Answer

The presence of lone pairs of electrons.

Answer

The number of electron pairs around the central atom.

Question 47

What is the shape of a molecule with 3 electron pairs and 0 lone pairs?

Accepted Answer

Trigonal planar.

Answer

Linear.

Answer

Bent.

Answer

Tetrahedral.

Question 48

Which molecular shape has a bond angle of 180 degrees?

Accepted Answer

Linear.

Answer

Trigonal planar.

Answer

Bent.

Answer

Tetrahedral.

Question 49

In a molecule with 4 electron pairs and 1 lone pair, what is the resulting shape?

Accepted Answer

Trigonal pyramidal.

Answer

Bent.

Answer

Tetrahedral.

Answer

Linear.

Question 50

What is the definition of an ionic bond?

Accepted Answer

A chemical bond formed between two ions with opposite charges

Answer

A bond formed between a metal and a nonmetal

Answer

A bond formed between two atoms of the same element

Answer

A bond formed between two nonmetals

Related quizzes

Related quizzes