Chemistry general revision 2024 - 2025

What is the atomic number?

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of protons in the energy levels

What is the mass number?

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of protons and electrons in the atom

What is the atomic number of this atom?

• 1

• 3

• 4

• 7

How is the number of neutrons in the nucleus of an atom calculated?

• Add the number of e- and p+ together

• Subtract the number of p+ from the mass number

• Subtract the number of e- from p+

• Add the mass number to the number of e-

What subatomic particles would you find in the nucleus of an atom?

• Protons only

• Neutrons and Electrons

• Protons and Neutrons

• Protons and Electrons

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 12 neutrons

• 12 protons

• 12 electrons

• 24 protons and neutrons

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 10

• 20

• 25

• 35

What is the atomic number of the atom pictured?

• 9

• 8

• 18

• 19

Which of the following determines the identity of an element?

• number of protons

• number of neutrons

• atomic mass

• number of shells

Elements which are shiny, conduct electricity and heat are called

• metal

• metalloid

• nonmetal

• nonexistent