Chemistry Unit 2: Atomic Structure Re-TEST

A neutral atom of a certain element has the electron configuration 1s2 2s2 2p6 3s2 3p2. How many valence electrons does the atom have?

• 4

• 11

• 6

• 16

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What makes an atom electrically neutral?

• The number of protons is equal to the number of electrons.

• The number of protons is equal to the number of neutrons.

• The neutrons balance out the protons and electrons.

• The nuclear forces contained in the atom neutralize the atom.

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This is an electron dot diagram or Lewis structure. Which element is represented?

• bromine (Br)

• chloride (Cl)

• boron (B)

• phosphorus (P)

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Which isotope has the greatest number of protons?

• Pa-238

• Pu-239

• U-240

• Np-238

This is the electron configuration for: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁵

• iodine

• sodium

• bromine

• magnesium

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The maximum number of electrons that a single orbital in the 3p sublevel may contain is:

• 2

• 6

• 10

• 14

Which two statements BEST describes the Quantum Mechanical model of the atom?

• Electrons orbit around the nucleus in set paths.

• Electrons are arranged on a large, solid, positive center.

• Electrons make up most of the mass of an atom.

• Orbitals are a region in space where there is a 90% probability of finding an electron. Electrons have properties similar to waves

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Which of the following describes how anions are formed?

• Electrons are gained giving the ion more negative charges than positive, and an overall negative charge.

• Electrons are lost giving the ion more positive charges than negative, and an overall positive charge.

• Electrons are lost giving the ion more negative charges than positive, and an overall negative charge.

• Electrons are gained giving the ion more positive charges than negative, and an overall positive charge.

This image depicts which orbitals in an atom?

• s orbitals

• p orbitals

• d orbitals

• f orbitals

Which of the following sets is correct?

• Zn-65, 65 protons, 65 electrons

• Mg-24, 12 protons, 14 neutrons

• U-238, 92 protons, 146 neutrons

• Pb-207, 207 protons, 207 electrons

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