Unit 3

Question 1

How many valence electrons does Calcium have?

Answer 1

2 It’s in Group 2.

Question 2

How many valence electrons does Bromine have?

Answer 2

7 It’s in Group 17.

Question 3

How many valence electrons does Helium have?

Answer 3

2

Question 4

How many valence electrons does Neon have?

Answer 4

8

Question 5

Which element, Xenon or Lithium, has a full outer shell of electrons?

Answer 5

Xenon; it is a noble gas, group 18

Question 6

Which has the highest electronegativity, Neon or Oxygen?

Answer 6

Oxygen. Reason: Neon is a noble gas and thus has 0 electronegativity.

Question 7

Which has the highest ionization energy, Mg or Sr?

Answer 7

Mg Ionization decreases as it goes down the group.

Question 8

Which has a smaller atomic radius, Ag or Xe?

Answer 8

Xe Atomic radius decreases across the period from left to right.

Question 9

Which has a smaller ionic radius, Li or Li+?

Answer 9

Li+

Question 10

Which has a smaller ionic radius, F or F-?

Answer 10

F

Question 11

Elements in the same group have the same number of _____ ______.

Answer 11

valence electrons

Question 12

What is the most important characteristic in determining an element’s chemical properties?

Answer 12

the number of valence electrons it contains

Question 13

Which group will have an electron configuration that ends in s²?

Answer 13

Alkaline Earth metals

Question 14

What element is this electron configuration showing, 1s²2s²2p⁶3s²3p⁶4s²3d⁶?

Answer 14

Fe

Question 15

Which element is this showing, [Ar]1s¹?

Answer 15

K

Question 16

Which property describes how much energy must be added to an atom to remove an outermost electron?

Answer 16

Ionization energy

Question 17

Which element has the highest atomic radius?

Answer 17

Fr

Question 18

Which group is the noble gases?

Answer 18

Group 18

Question 19

Which element has the highest electronegativity?

Answer 19

F

Question 20

The majority of transition metals are in which block? s,p,d, or f

Answer 20

d

Question 21

Unknown element X has 5 energy levels, 5 valence electrons, and is a metalloid. What is X?

Answer 21

Sb

Question 22

The main energy level that can hold only two electrons is the _____.

Answer 22

first level

Question 23

Which element has the greatest electron affinity?

Answer 23

F

Question 24

Which of the following (UV light, radio waves, x-rays, gamma rays) has a longer wavelength?

Answer 24

radio waves

Question 25

Which of the following (UV light, radio waves, x-rays, gamma rays) has a higher frequency?

Answer 25

gamma rays

Question 26

What is the order of visible light from lowest to highest frequency?

Answer 26

ROY G BV red orange yellow green blue violet

Question 27

Element X has many of the same physical and chemical properties as Mg and Sr but has a lower atomic mass? Is it Na or Be?

Answer 27

Be

Question 28

Elements in the same _____ have chemical properties that are the most similar.

Answer 28

group

Question 29

Which element (Co or Cd) has 10 electrons in the d orbital?

Answer 29

Cd

Question 30

What is the frequency of light with a wavelength of 2.00 x 10⁻⁸m?

Answer 30

speed of light /wavelength = frequency (3.00x10⁸m/s)/(2.00x10⁻⁸m)= 1.50x10¹⁶Hz

Question 31

What is the wavelength in m of a photon that has an energy of 2.2 x 10⁻²⁰J?

Answer 31

(Plancks constant)(speed of lite)/Energy=wavelength (6.63x10⁻³⁴Js)(3.0x10⁸m/s)/(2.2x10⁻²⁰J)=9.0x10⁻⁶m

Question 32

What is the frequency of a photon with energy of 2.0x10⁻²⁵J?

Answer 32

(energy)/(Plancks constant)=frequency (2.0x10⁻²⁵J)/(6.63x10⁻³⁴Js)=3.0x10⁸Hz

Question 33

Find the energy of a photon with a frequency of 5.0x10¹⁴Hz.

Answer 33

(Planck’s constant)(frequency)=energy (6.63x10⁻³⁴Js)(5.0x10¹⁴Hz) = 3.3x10⁻¹⁹J

Question 34

Find the frequency of a photon with a wavelength of 5.0x10⁻⁷m.

Answer 34

(speed of light)/(wavelength)=frequency (3.0x10⁸m/s)/(5.0x10⁻⁷m)=6.0x10¹⁴Hz

Question 35

Label a wave with trough, crest, wavelength. and amplitude.

Answer 35

Question 36

What is the orbital diagram for Nitrogen?

Answer 36