Question 1

What is the smallest unit of matter that retains all the chemical properties of an element?

Accepted Answer

Atom

Answer

Compound

Answer

Molecule

Answer

Ion

Question 2

What is the Greek origin of the word 'atom'?

Accepted Answer

Atomos

Answer

Matteros

Answer

Molekula

Answer

Subatomos

Question 3

Which particles are located in the nucleus of an atom?

Accepted Answer

Protons and Neutrons

Answer

Electrons and Neutrons

Answer

Protons and Electrons

Answer

Electrons only

Question 4

What is the charge of protons?

Accepted Answer

Positive

Answer

No charge

Answer

Negative

Answer

Neutral

Question 5

How much does an electron weigh compared to a proton?

Accepted Answer

1/1800 of an atomic mass unit

Answer

The same as a proton

Answer

About 1 amu

Answer

1/100 of an atomic mass unit

Question 6

What determines the mass number of an element?

Accepted Answer

Protons plus Neutrons

Answer

Protons plus Electrons

Answer

Protons only

Answer

Electrons plus Neutrons

Question 7

In a neutral atom, how do the number of protons compare to the number of electrons?

Accepted Answer

They are equal

Answer

Protons are greater

Answer

They are different

Answer

Electrons are greater

Question 8

What does the atomic number represent?

Accepted Answer

Number of protons

Answer

Number of electrons

Answer

Sum of protons and neutrons

Answer

Number of neutrons

Question 9

What element has 8 protons?

Accepted Answer

Oxygen

Answer

Carbon

Answer

Helium

Answer

Nitrogen

Question 10

Which particles are considered subatomic?

Accepted Answer

Protons, Neutrons, and Electrons

Answer

Only Protons and Neutrons

Answer

Ions and Isotopes

Answer

Atoms and Molecules

Question 11

What is the center of an atom called?

Accepted Answer

atomic nucleus

Answer

proton ring

Answer

neutron shell

Answer

electron cloud

Question 12

What determines the chemical properties of an element?

Accepted Answer

the number of protons

Answer

the mass of electrons

Answer

the shape of the atom

Answer

the number of neutrons

Question 13

What do you call atoms of the same element with different numbers of neutrons?

Accepted Answer

isotopes

Answer

molecules

Answer

allotropes

Answer

ions

Question 14

Which type of isotope does not decay into other elements?

Accepted Answer

stable isotope

Answer

radioactive isotope

Answer

unstable isotope

Answer

decaying isotope

Question 15

What is the mass of an electron compared to protons and neutrons?

Accepted Answer

negligible

Answer

heavier

Answer

equal

Answer

greater

Question 16

What is the atomic number?

Accepted Answer

number of protons

Answer

number of electrons

Answer

number of neutrons

Answer

mass of the atom

Question 17

Which of the following is a use of radioactive isotopes?

Accepted Answer

medicine

Answer

food preservation

Answer

soil stabilization

Answer

water management

Question 18

What is a common application of stable isotopes?

Accepted Answer

environmental studies

Answer

carbon dating

Answer

nuclear energy

Answer

radiation therapy

Question 19

How do radioactive isotopes become stable?

Accepted Answer

by decaying

Answer

by combining with other isotopes

Answer

by gaining electrons

Answer

by increasing mass

Question 20

What might isotopes with different masses affect?

Accepted Answer

mass measurement

Answer

taste

Answer

smell

Answer

color

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