Unit Test — Unit test Answers — EO Night School…

Which statement best describes how electrons fill orbitals in the periodic table?

Electrons fill orbitals in order of their increasing energy from left to right.

Electrons fill orbitals in order of their increasing energy from right to left.

Elements fill orbitals in order of increasing energy from top to bottom in each group.

Elements fill orbitals in order of increasing energy from bottom to top in each group.

Which element has the largest atomic radius?

Which substance is a mixture?

table salt

gasoline

aluminum

carbon dioxide

When electrons are removed from the outermost shell of a calcium atom, the atom becomes

an anion that has a larger radius than the atom.

an anion that has a smaller radius than the atom.

a cation that has a larger radius than the atom.

a cation that has a smaller radius than the atom.

Which pure substance can be classified as an element?

NO3

NaCl

H2SO4

Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes?

The number of protons ranges from 1 to 3.

The number of electrons ranges from 1 to 3.

The number of neutrons ranges from 0 to 2.

The number of protons ranges from 0 to 2.

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