Answers TX-Integrated Physics and Chemistry A-CRUnit Test

Unit Test — Unit test Answers

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Which element has a complete valence electron shell?

selenium (Se)

oxygen (O)

fluorine (F)

argon (Ar)

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Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.

Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.

Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Krypton is a noble gas, so it secretly bonds with every type of element without showing it.

Based on the information in the table, which elements are most likely in the same periods of the periodic table?

Boron and carbon are likely together in one period because they have very close atomic masses, while gallium and germanium are likely together in another period because they have very close atomic masses.

Aluminum, boron, and carbon are likely together in one period because they were first isolated in the first half of the 1800s, while gallium and germanium are likely together in another period because they were first isolated in the second half.

Boron and carbon are likely together in one period because they each end in “-on,” while aluminum, gallium, and germanium are likely together in another period because they each end in “-ium.”

Aluminum, boron, and gallium are likely together in one group because they have the same number of valence electrons, and carbon and germanium are likely together in another group because they have the same number of valence electrons.

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?

The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.

The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.

The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.

The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

Which cannot be chemically broken down into simpler substances?

compound

element

solution

mixture

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