Elements and compounds

Pure substances made up of one kind of atom are called:

• elements

• compounds

• mixtures

• solutions

The smallest neutral particle of an element is called:

• an atom

• a molecule

• a compound

• a formuls

Positively charged particles found in the nucleus of an atom are called:

• neutrons

• electrons

• protons

• shells

Negatively charged particles found in an atom are the:

• protons

• neutrons

• nucleus

• electrons

Particles with no electrical charges found in the center of an atom are the:

• neutrons

• electrons

• nucleus

• protons

A lithium atom has 3 protons, so it must have:

• 3 neutrons as well

• 3 electrons as well

• no electrons

• 6 electrons as well

A sodium (Na) atom has 11 electrons. Its electron arrangement would be:

• 8, 2, 1

• 10, 1

• 2, 8, 1

• 2, 9

An atom with an electron arrangement of 2, 8, 1 will:

• Lose 1 electron to form a positive ion

• gain 1 electron to form a negative ion

• gain 7 electrons to form a negative ion

• lose 1 electron to form a negative ion

The atomic number of Chlorine (Cl) atom is 17. Its electron arrangement would be:

• 7, 8, 2

• 2, 8, 7

• 10, 7

• 7, 10

An atom with an electron arrangement of 2, 8, 7 would:

• gain 1 electron to form a negative ion

• lose 7 electrons to form a positive ion

• gain 1 electron to form a positive ion

• not lose or gain electrons.