Elements and the Periodic Table

The atomic number of an atom is...

• the mass of the atom

• the number of protons

• the number of protons added to the number of neutrons

• always 10

True or False

Copper is an excellent conductor

True or False

Gold is an excellent conductor

Which of the following typically has one valence electron?

• magnesium

• helium

• sodium

• carbon

Which is gas at room temperature?

• mercury

• potassium

• nitrogen

• aluminum

Tags

NGSS.MS-PS1-4

Which element would react violently with sodium?

• helium

• chlorine

• oxygen

• boron

Tags

NGSS.MS-PS1-2

Which element is considered a malleable substance?

• radon

• sulfur

• hydrogen

• gold

Which element has 6 electrons?

• sulfur

• oxygen

• helium

• carbon

Tags

NGSS.MS-PS1-1

Which has the highest melting point?

• neon

• silver

• hydrogen

• bromine

Tags

NGSS.MS-PS1-4

Which element is the most reactive?

• lithium

• helium

• iron

• oxygen

Tags

NGSS.MS-PS1-5