Question 1

What is the smallest unit of an element that retains its identity in a chemical reaction?

Accepted Answer

Atom

Answer

Compound

Answer

Ion

Answer

Molecule

Question 2

What particle in an atom carries a positive charge?

Accepted Answer

Proton

Answer

Neutron

Answer

Electron

Answer

Positron

Question 3

What is the charge of an electron?

Accepted Answer

Negative

Answer

No charge

Answer

Neutral

Answer

Positive

Question 4

Which subatomic particle is located in the nucleus and has no charge?

Accepted Answer

Neutron

Answer

Proton

Answer

Photon

Answer

Electron

Question 5

What is the main component of the nucleus of an atom?

Accepted Answer

Protons and neutrons

Answer

Photons

Answer

Molecules

Answer

Electrons

Question 6

What is the overall charge of an atom if it has an equal number of protons and electrons?

Accepted Answer

Neutral

Answer

Negative

Answer

Unstable

Answer

Positive

Question 7

In which part of the atom are electrons found?

Accepted Answer

Electron cloud

Answer

Neutron shell

Answer

Nucleus

Answer

Proton shell

Question 8

What is the term for atoms of the same element that have different numbers of neutrons?

Accepted Answer

Isotopes

Answer

Elements

Answer

Molecules

Answer

Ions

Question 9

Which particle is responsible for the chemical properties of an element?

Accepted Answer

Electron

Answer

Proton

Answer

Photon

Answer

Neutron

Question 10

In nuclide notation, what does the top number represent?

Accepted Answer

The mass number

Answer

The charge of the atom

Answer

The number of protons

Answer

The atomic number

Question 11

What does the bottom number in nuclide notation indicate?

Accepted Answer

The atomic number

Answer

The mass number

Answer

The charge of the atom

Answer

The number of neutrons

Question 12

Which of the following is the correct nuclide notation for an isotope of Carbon with 6 neutrons?

Accepted Answer

Answer

Answer

Answer

Question 13

If a nuclide is represented as

^{23}_{11}Na

, what is the number of neutrons in this nuclide?

Accepted Answer

12

Answer

10

Answer

23

Answer

11

Question 14

In nuclide notation, what does

^{23}_{11}Na

represent?

Accepted Answer

Sulfur with a mass number of 34

Answer

Oxygen with a mass number of 34

Answer

Sulfur with a mass number of 16

Answer

Sodium with a mass number of 34

Question 15

What would be the correct nuclide notation for an isotope of Hydrogen with one proton and two neutrons?

Accepted Answer

Answer

Answer

Answer

Question 16

Which of the following describes the difference between isotopes as shown in nuclide notation?

Accepted Answer

They have the same atomic number but different mass numbers

Answer

They have different atomic numbers and mass numbers

Answer

They have the same number of neutrons

Answer

They have the same mass number but different atomic numbers

Question 17

What is the correct interpretation of the nuclide notation

^{23}_{11}Na

?

Accepted Answer

Uranium with a mass number of 238

Answer

Lead with a mass number of 238

Answer

Uranium with a mass number of 92

Answer

Uranium-235

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