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WorksheetsChapter 20 8th Grade Science Putman
Total questions: 10
Worksheet time: 5mins
In a chemical formula, the number of each type of atom in the compound is shown by numbers called _______.
superscripts
oxidation numbers
chemical symbols
subscripts
The elements that make up a compound and the exact number of atoms of each element in a unit of the compound can be shown in a ____.
chemical formula
superscript
chemical symbol
subscript
A chemical bond that occurs when atoms share electrons is a(n) ____ bond.
covalent
polyatomic
ionic
magnetic
The ____ tells you how many electrons an atom must gain, lose, or share to become stable.
atomic mass
ionic number
atomic number
oxidation number
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
8
6
4
2
What kind of chemical bond is formed when an equal exchange of electrons occurs?
ionic
magnetic
hydrate
covalent
How many hydrogen atoms are present in one molecule of ammonium acetate, NH4C2H3O2?
2
4
6
8
What is the name of the compound with the formula NaCl?
sodium chloride
sodium dichloride
chlorine sodiate
sodium chlorate
Why do the noble gases NOT form compounds readily?
They have seven electrons in the outer
energy levels.
They have no electrons.
They have empty outer energy levels.
Their outer energy levels are
completely filled with electrons.
What is the name of a binary compound made up of lithium and chlorine?
lithium chloride
lithium chlorate
chlorine lithium
chlorine lithiate
