The chemistry of life

The center of an atom is known as the

• nucleus

• electron cloud

• neutron cloud

• mass circle

Protons have this type of charge

• positive
• negative
• neutral - no charge

A particle that orbits around the nucleus is a(n)...

• Proton
• Neutron
• Electron
• Quark

What does the nucleus of an atom contain?

• Electrons and neutrons

• Protons and neutrons

• Neutrinos and positrons

• Electrons and megatrons

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

• 20

• 10

• 35

• 25

What is the tiniest representative particle of matter within the entire universe?

• cells

• gases

• atoms

• liquids

What do we call a substance composed of atoms of a singular type?

• cell

• proton

• element

• atom

What is the term used for the substances that are formed when 2 or more atoms from differing elements come together?

• atoms

• elements

• molecules

• compounds

Are these molecules of elements, compounds or mixtures?

• elements

• compounds

• mixtures

What is gold?

• element
• compound
• mixture