Atoms 2

The first energy level of electrons in an atom can hold ____ electrons.

• 2
• 1
• 3
• 4
• 5

Center of an atom

• electron
• molecule
• neutron
• nucleus
• proton

Substance made up of only one kind of atom

• compound
• element
• molecule
• nucleus
• periodic table

Subatomic Particle with a positive charge

• atom
• electron
• neutron
• nucleus
• proton

Smallest unit of an element with all the properties of that element

• atom
• compound
• element
• molecule
• nucleus

Subatomic particle with no charge

• electron
• element
• neutron
• nucleus
• proton

Two or more atoms joined together

• compound
• element
• molecule
• nucleus
• periodic table

Atoms are held together by the attraction between

• protons and neutrons
• electrons and protons
• electrons and neutrons
• protons and the nucleus

The atomic number of an element is the number of _____ in its nucleus

• atoms
• protons
• neutrons
• electrons

The third energy level of electrons in an atom can hold ____ electrons.

• 18
• 1
• 2
• 3
• 4