Chemistry Review

Which of these elements has 8 valence electrons?

• P

• Be

• O

• Ar

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This could be the dot diagram of

• Ne

• H

• C

• F

Tags

NGSS.HS-PS1-1

What is the atomic number of this atom?

• 2

• 4

• 6

• none of the above

What is the approximate mass of a proton?

• 1 u
• 0.0005 u
• 1 g 
• 0.0005 g

An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes...

• a positive ion
• a negative ion
• an atom in an excited state
• an atom in the ground state

Which particle has NO charge?

• electron
• neutron
• positron
• proton

Which quantity represents the number of protons in an atom?

• atomic number
• oxidation number
• number of neutrons
• number of valence electrons

The element sulfur is classified as a...

• metal
• metalloid
• nonmetal
• noble gas

The elements in Group 2 have similar chemical properties because each atom of these elements has the same...

• atomic number
• mass number
• number of electron shells
• number of valence electrons

Which term represents the attraction one atom has for the electrons in a bond with another atom?

• electronegativity
• electrical conductivity
• first ionization energy
• mechanical energy