Atomic Structure

The element with the symbol H is:

• hydrogen

• helium

• water

• hafnium

The element with the symbol Cu is:

• copper.

• lead.

• chromium.

• cobalt.

The element with the symbol Pb is:

• potassium.

• lead.

• iron.

• phosphorous.

The element with the symbol Cl is:

• carbon.

• chlorine.

• chromium.

• cobalt.

The element with the atomic number 14 is:

• silicon.

• nitrogen.

• carbon.

• neon.

The element with atomic number 27 is:

• cobalt.

• copper.

• aluminium.

• manganese.

How many protons does vanadium have?

• 23

• 51

• 28

• 20

How many protons does tin have?

• 22

• 52

• 50

• 119

Atoms of which of the following elements has the most protons?

• iron

• sulfur

• aluminium

• boron

Atoms of which of the following elements have the most protons?

• carbon

• fluorine

• sodium

• chlorine