Pre-AP Chemistry unit 3

The element X has two naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope. Abundance (%). Mass (amu) 31X. 35.16%. 31.16 amu 34X. 64.84%. 34.30 amu

33.20

The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope. Abundance(%) Mass(amu) 53x. 19.61%. 52.62 amu 56x. 53.91%. 56.29 amu 58x. 26.48%. 58.31 amu

56.11

An atom of the most common isotope of gold, 197Au, has __________ protons, __________ neutrons, and __________ electrons.

79, 118, 79

Vertical columns are called what?

Groups or families

Which pair of elements below should be the most similar in chemical properties? A. I and Br B. K and Kr C. Cos and He D. C and O E. B and As

I and Br

Elements __________ exhibit similar physical and chemical properties.

In the same group of the periodic table

The effective nuclear charge of an atom is primarily affected by________

Inner electrons

Molecule

Is an assembly of two or more non-metals or non-metals + metalloid atoms tightly bound together

Calcium is a __________ and silver is a __________.

Metal, metal

Different isotopes of a particular element contain different numbers of __________.

Neutrons

All atoms of a given element have the same?

Number of protons

Mass number

Number of protons plus neutrons

Horizontal rows are called what?

Periods

Which one of the following atoms has the largest radius? A. O B. F C. Cl D. Ne E. S

S

Atomic number

The number of protons in the nucleus of any particular element (it the whole number)

Protons and electrons have the same number in an atom. True or False

True

an element that appears in the lowest left corner of the periodic table is________

a metal

formula units

compounds that aren't molecules

elements_____________exhibit similar physical and chemical properties

in the same group of the periodic table

calcium is a _______ and silver is a ______

metal, metal

different isotopes of a particular element contain different numbers of_______

neutrons

oxygen is a ________ and nitrogen is a ________

nonmetal, nonmetal

electrons in the 1s subshell are much closer to the nucleus in Ar than in He due to the larger_______In Ar

nuclear charge

all atoms of a given element have the same

number of protons

In the periodic table, the elements are arranged in __________.

order of increasing atomic number

in the periodic table, the elements are arranged in_________?

order of increasing atomic number

isotopes are atoms that have the same number of ___________but differing number of___________

protons, neutrons