Chemistry Grade 7 atomic structure

atomic number is

• the number of protons

• the number of electrons in the last shell

• the number of neutrons

• the location of an atom on the periodic table

Atomic Mass is the number of

• protons and neutrons in the nucleus of an atom

• protons and electrons in the nucleus of an atom

• neutrons and electrons in the nucleus of an atom

Water is the product of the reactants:

• oxygen and water

• oxygen and carbon

• hydrogen and oxygen

What is the number of protons that the element in this image contain?

• 14

• 7

• 15

• 18

The proper formula for magnesium hydroxide:

• MgOH

• Mg₂OH

• Mg(OH)₂

• Mg₂OH₂

How do the following two elements bond together?

Al³⁺ O^2-

• AlO

• Al₂O₃

• Al₃O₆

• Al₃O₂

neutrons

• no charge, shells

• positive charge, nucleus

• neutral, no charge, nucleus

• negative charge, shells

The ________________ tells you how many energy levels are used in an element.

• group number
• atom
• protons
• period number

The group number tells us how many _________ there are in an element.

• groups
• valence electrons
• energy levels
• chemicals

No. of electrons present in the last shell of Magnesium atom is_______________(type only the DIGIT/Number)