Atomic Structure

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

• Protons only

• Protons and Neutrons

• Protons and Electrons

Which two subatomic particles contribute the most to the mass of an atom?

• Protons and Electrons

• Protons and Quantums

• Protons and Neutrons

Look at the diagram: How many protons does Nitrogen have?

• 7

• 14

• 21

True or False: Equal numbers of Protons and Electrons balance the charge of an atom.

• True

• False

What must a neutral atom have If it has 12 protons?

• 12 neutrons

• 12 electrons

• 12 quantums

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

• 10

• 25

• 35

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 5

• 6

• 16

If you know the atomic number of an element, then you know the number of these subatomic particles.

• neutrons and electrons

• protons and electrons

• protons and neutrons

The mass of one proton is about the same as this sub atomic particle.

• neutron

• electron

• quantum

Look at the diagram: Which letter represents a proton?

• A

• B

• C