Chemistry

What is the atomic number?

• number of protons
• number of neutrons
• mass

What is the atomic mass?

• the number of protons
• the sum of the number of protons and the number of neutrons in the nucleus of an atom 

an electron has this charge

• positive
• negative
• neutral

a neutron has this charge

• negative
• positive
• neutral

a proton has this charge

• negative
• positive
• neutral

atoms of the same element with different numbers of neutrons are...

• isotopes
• quarks
• atoms
• elements

An element is composed of how many types of atoms?

• 5
• 3
• 1

vertical columns in the periodic table are _________ of elements with similar properties. 

• groups
• periods

_______ are horizontal rows of elements that contain increasing numbers of protons and electrons.

• groups
• periods
• families

Elements that have properties of both metals and nonmetals are _____

• metals
• metalloids
• nonmetals