AP BIO PREP - QUICK PERIODIC TABLE REVIEW

Which of the following is the key characteristic that is ultimately responsible for the unique chemical properties of each element? (Hint from Mr. Taase: focus on the nucleus)

• Each element has a unique atomic mass.

• Each element has a unique atomic number.

• Each element has a unique number of protons.

• Each element has a unique number of neutrons.

Given only a mass number, one can deduce the number of ________ in each atom of an element.

• protons

• neutrons

• electrons

• protons plus electrons

• protons plus neutrons

Which of the following properties is common among elements in the same column of the periodic table?

• They have the same number of protons.

• They have the same number of neutrons.

• They have the same number of electrons.

• They have the same number of electrons in their valence shell.

• They have the same number of electron shells.

Which of the following properties is shared by elements in the same row of the periodic table?

• They have the same number of protons.

• They have the same number of neutrons.

• They have the same number of electrons.

• They have the same number of electrons in their valence shell.

• They have the same number of electron shells.

The nucleus of a nitrogen atom contains 8 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen?

• The nitrogen atom has a mass number of 14 and an atomic number of 7.

• The nitrogen atom has a mass number of 15 and an atomic number of 7.

• The nitrogen atom has a mass number of 15 and an atomic number of 8.

• The nitrogen atom has a mass number of 15 and an atomic number of 15.

The left-to-right position of an element in the first three rows of the periodic table indicates which of the following properties of the element?

• the total number of electrons in the element

• the total number of protons in the element

• the total number of neutrons in the element

• the number of electron orbitals in the element

• the number of electrons in the valence shell

The chemical behavior of an atom depends primarily upon which of the following?

• the number of neutrons in the nucleus

• the number of protons in the nucleus

• the number of electrons in the valence shell

• the total number of electrons contained by the atom

• the number of electron shells contained by the atom

Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers of 92, 94, 95, 96, 97, 98, and 100. Therefore, which of the following is true?

• The isotopes of molybdenum can have between 50 and 58 neutrons.

• The isotopes of molybdenum have different numbers of valence electrons.

• The isotopes of molybdenum can have between 50 and 58 protons.

• The isotopes of molybdenum can have between 92 and 100 electrons.

One difference between ¹²C and ¹⁴C is that ¹⁴C has...

• ...two more protons than carbon-12.

• ...two more electrons than carbon-12.

• ...two more neutrons than carbon-12.

• ...two more protons and two more neutrons than carbon-12.

• ...two more electrons and two more protons than carbon-12.

An atom has 6 electrons in its outer shell. How many unpaired electrons does it have?

• 0

• 2

• 4

• 6