3/14 - Chemistry

In the ground state, valence electrons of a krypton atom are found in

• the first shell

• the outermost shell

• both the nucleus and the first shell

• both the first shell and the outermost shell

Which element is malleable at STP?

• chlorine

• copper

• helium

• sulfur

Which term represents the sum of the atomic masses of the atoms in a molecule?

• atomic number

• mass number

• formula mass

• percent composition by mass