Atomic Structure

What are the subatomic particles in atoms?

• proton

• neutron

• electron

• molecule

Proton is positively charged (+1).

• True

• False

How is electron charged?

• +1

• -1

• 0 (neutral)

Which numbers are added to give the mass number of an atom?

• number of protons + number of neutrons

• number of electrons + number of neutrons

• number of electrons + number of protons

• number of electrons + number of protons + number of neutrons

An aluminium atom has a nucleon number of 27 and a proton number of 13.

How many neutrons does this aluminum atom contain?

• 13

• 14

• 17

• 40

Which two particles are isotopes? (read the table)

• W and X

• W and Y

• X and Z

• Y and Z

What do the nuclei of ¹₁H hydrogen atoms contain?

• electrons and neutrons

• electrons and protons

• neutrons only

• protons only

What do the nuclei of ³⁷₁₇Cl chlorine atoms contain?

• electrons and neutrons

• electrons and protons

• 17 protons and 20 neutrons

• 20 protons and 17 neutrons

What are the reasons why noble gases are unreactive?

• They have very stable electron arrangement.

• There are 8 electrons in the outer shell (2 for the helium atom).

• They are very small.

• They are very shy.

Use the Periodic Table to help you name the element.

the element with an electronic configuration of 2, 8, 2