Atomic Structure

What are the relative charges of the sub-atomic particles?

proton: ​ (a)  

neutron: ​ (b)  

electron: ​ (c)  

• +1
• 0
• -1

What are the relative masses of the sub-atomic particles?

proton: ​ 1

neutron: ​ ​ ​ (a)  

electron: ​ ​ (b)  

• 1
• 0
• -1

Proton number and atomic number is the same.

• True

• False

Nucleon number and mass number of an atom is the same.

• True

• False

Nucleon number and neutron number of an atom is the same.

• True

• False

Two different elements can have the same proton number.

• True

• False

Answer explanation

Each element has a unique proton number. E.g. Oxygen has 8 protons and no other element has 8 protons.

Two different elements can have the same mass number.

• True

• False

Answer explanation

Argon and Calcium have the same relative atomic mass.

In an atom, the number of protons is always equal to the number of neutrons.

• True

• False

In an atom, the number of protons is always equal to the number of electrons.

• True

• False

Answer explanation

Atoms are electrically neutral.
All the positive charges (from protons) balance/equal to all the negative charges (from electrons)

In an ion, the number of protons is equal to the number of electrons.

• True

• False

Answer explanation

Atoms are electrically neutral. But ions have either lost or gained electrons.