Atomic Concepts

Explain why isotopes of the same element have different atomic masses.

• They have different numbers of protons.

• They have different numbers of electrons.

• They have different numbers of neutrons.

• They have different numbers of valence electrons.

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

• Proton

• Neutron

• Electron

• Positron

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Which of the following describes an atom in the ground state?

• An electron in the highest energy level

• An electron in the lowest energy level

• An electron in a higher energy level than normal

• An electron in the nucleus

Label this atom's particles.

a

b

c

d

Protons

Nucleus

Electrons

Neutrons

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Label the two parts of the atom here.

b

a

Nucleus

Electron cloud

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What subatomic particles are coloured green in this image?

(a)  

• electrons

• protons

• neutrons

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Which subatomic particle has a positive charge?

• Electron

• Proton

• Neutron

• Positron

What is the electron configuration for a neutral atom of oxygen?

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How many valence electrons does a chlorine atom have?

• 5

• 6

• 7

• 8

Which element has the highest electronegativity?

• Fluorine

• Oxygen

• Nitrogen

• Chlorine

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