Test Q

Question 1

How many electrons are in the highest occupied energy level of atoms in group 5a?

Answer 1

5 electrons

Question 2

In 1829, the German chemist J.R. Dobereiner published a classification system in which elements were put into groups their properties, how many elements did he put into each of his groups?

Answer 2

He put them into a triad - 3 elements

Question 3

Which group of elements are known as the Alkali metals?

Answer 3

Group 1A

Question 4

Which of the following factors contributes in the increase of ionization energy from left to right in a period?

Answer 4

An increase of the number of protons

Question 5

Who first suggested the idea of atoms

Answer 5

Democritus

Question 6

What discovery did J.J. Thompson make that improved upon Dalton’s theory?

Answer 6

Atoms contain tiny, negatively charged electrons

Question 7

What is true about subatomic particles?

Answer 7

The mass of a neutron nearly equals the mass of a proton

Question 8

What was originally a tenet of Dalton’s theory but had to be revised about a century ago?

Answer 8

Atoms are tiny indivisible particles

Question 9

All atoms are:

Answer 9

Neutral, with the number of protons equaling the number of electrons

Question 10

The atomic number of an element is the total number of which particles in the nucleus?

Answer 10

Protons

Question 11

The sum of the protons and neutrons in an atom equals the

Answer 11

Mass number

Question 12

Isotopes of the same elements have different

Answer 12

Numbers of neutrons

Question 13

How many protons, electrons, and neutrons does an atom with the atomic number 50 and mass number of 125 contain?

Answer 13

Protons : 50
Electrons: 50
Neutrons : 75

Question 14

What unit is used to measure weighted average atomic mass

Answer 14

Amu

Question 15

How does the energy of an electron change when the electron moves closer to the nucleus?

Answer 15

It decreases

Question 16

Why do chemists use relative masses of atoms compared to a reference isotope rather than the actual masses of atoms ?

Answer 16

The actual masses of atoms ar very small and difficult to work with

Question 17

The principal quantum number indicates what property of an electron?

Answer 17

Energy level

Question 18

How many sublevels are inter second principle energy level

Answer 18

2

Question 19

What is the maximum number of electrons in the second principle energy level

Answer 19

8

Question 20

What types of atomic orbitals are in the third principle energy level

Answer 20

S , p, and d only

Question 21

According to the aufbau principle

Answer 21

Electrons enter orbitals of the lowest energy first

Question 22

How many unpaired electrons are in a sulfur atom, which has an atomic number of 16?

Answer 22

2

Question 23

What idea did Dalton’s atomic theory include?

Answer 23

Atoms of the same element are always identical

Question 24

The nucleus of an atom is

Answer 24

The central core and is composed of protons and neutrons

Question 25

Halide ion

Answer 25

An anion of chlorine or other halogen

Question 26

Octet rule

Answer 26

Anions reacts so as to acquire the stable electron structure of a noble gas

Question 27

Ionic bond

Answer 27

The force of attraction binding oppositely charged ions together

Question 28

Electron dot structure

Answer 28

A depiction of valence electrons around the symbol of an element

Question 29

Valence electrons

Answer 29

An electron in the highest occupied energy level of an atom

Question 30

Coordination number

Answer 30

The number of ions of opposite charge surrounding each ion in a crystal

Question 31

Metallic bond

Answer 31

The attraction of valence electrons for metal ions

Question 32

The octet rule states that in chemical compounds, atoms tend to have

Answer 32

The electron configuration of a noble gas

Question 33

What occurs in an ionic bond

Answer 33

Oppositely charged ions attract

Question 34

What is the net charge of calcium fluoride

Answer 34

0

Question 35

Alloys are important because s

Answer 35

Their properties are often superior to those of their component elements

Question 36

An ionic bond is a bond between

Answer 36

A cation and an anion