Chemistry 1 Review

Electrons that are further from the nucleus have

• more energy

• less energy

• the same amount of energy as electrons close to the nucleus

Which of the following substances are elements?

• water

• salt

• carbon dioxide

• hydrogen

What charge does an electron have?

• Negative
• Positive
• Neutral
• Contrated

What is the atomic mass of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

Tags

NGSS.MS-PS1-1

What is a valence electron?

• an electron that is found in the outermost orbital of an atom. 
• an electron found in the innermost orbital of an atom.
• an electron found in the middle orbital.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Using the information provided, determine how many electrons the a Boron atom contains.

• 2.5

• 5

• 6

• 10.81

How many protons does this atom have?

• 2.5
• 6
• 5
• 10.811

Tags

NGSS.MS-PS1-1

Which of the following properties uniquely identifies every element?

• Number of valence electrons
• Phase at room temperature
• Number of protons
• Charge of the atom

An elements reactivity and other chemical properties are determined by the number of….

• isotopes it has.
• oxidation states
• orbitals in an atom.
• valence electrons