Year 9 Chemistry

"A positively charged subatomic particle found within the nucleus of an atom. "

• neutrons
• electrons
• protons
• molecules

Select the correct definition for the term atomic number.

• the number of atoms that make up a molecule
• the number of protons plus neutrons in the nucleus of an atom
• the number of possible isotopes for each element
• the number of protons or the number of electrons in a n atom

Determine how many electrons have been lost or gained by Cr3+

• Lost 4
• Gained 3
• Gained 2
• Lost 3

"Substances where two or more elements chemically combine."

• molecular elements
• mixtures
• compounds
• atoms

Describe when an atom will be most stable.

• when it has an empty inner electron shell
• when it has a full outer electron shell
• when it has one electron in its outer shell
• when it has all but on electron in its outer shell

Explain how atoms form ions.

• By gaining or losing protons from the nucleus
• by losing or gaining neutrons from the nucleus
• by gaining or losing electrons from the outer electron shell
• by gaining or losing electrons from the nucleus

Select the correct definition for the term atomic mass.

• the number of protons, neutrons and electrons in an atom
• the number of protons plus neutrons in the nucleus of an atom
• the number of atoms that make up a molecule
• the number of protons or the number of electrons in a n atom

Determine how many electrons have been lost or gained by K+

• lost 1
• lost 3
• gained 1
• gained 2

"Another name for the orbitals around the nucleus in which electrons spin."

• electron shells
• allotropes
• compounds
• subatomic particles

Determine how many electrons have been lost or gained by Cl-

• lost 1
• lost 3
• gained 1
• gained 2