CHEM - U2 Atomic History, Structure & Periodic Table

Question 1

Which rule is violated?

Accepted Answer

Hund's rule

Question 2

Why was the neutron the last of the subatomic particles to be discovered?

Accepted Answer

The nucleus has a neutral charge.

Question 3

How many neutrons does Al-35 have?

Accepted Answer

22

Question 4

If you change the number of protons in an atom then you have

Accepted Answer

a new element.

Question 5

Which rule is violated?

Accepted Answer

Pauli Exclusion Principal

Question 6

Which alkaline earth metal has the greatest atomic radii?

Accepted Answer

barium

Question 7

Electrons will enter the lowest energy level first.

Accepted Answer

Aufbau

Question 8

The current model of the atom is called the

Accepted Answer

quantum mechanical model.

Question 9

Mendeleev's periodic table was useful because

Accepted Answer

it could be used to determine properties of unknown elements

Question 10

How do you identify the number of protons in an atom?

Accepted Answer

atomic number

Question 11

Which of the following elements are in the same period as potassium?

Accepted Answer

Fe

Question 12

How many electrons are located in an orbital?

Accepted Answer

2

Question 13

Atoms that have the same number of protons but different numbers of neutrons.

Accepted Answer

Isotopes

Question 14

These two scientists believed the atom was indivisible.

Accepted Answer

Democritus and Dalton

Question 15

The current periodic table is organized by

Accepted Answer

number of protons

Question 16

The second principal energy level has _____ sublevels.

Accepted Answer

2

Question 17

This scientist is credited with discovering the proton with the Gold Foil experiment.

Accepted Answer

Rutherford

Question 18

Which of these nonmetals are the most electronegative?

Accepted Answer

Cl

Question 19

The energy required to remove an electron is referred to as

Accepted Answer

ionization energy.

Question 20

Elements with the same atomic number and different mass numbers.

Accepted Answer

Isotopes

Question 21

Electrons in an orbital must have the opposite spin.

Accepted Answer

Pauli's Exclusion Principal

Question 22

The average mass of the naturally occurring isotopes of an element.

Accepted Answer

atomic mass

Question 23

Bohr believed that electrons

Accepted Answer

travel in fixed orbits.

Question 24

Don't double electrons in orbitals of the same energy level until all orbitals have an electron

Accepted Answer

Hund's Rule

Question 25

What is the maximum number of electrons in the fourth energy level?

Accepted Answer

32

Question 26

How many protons and electrons in Mg2+?

Accepted Answer

10

Question 27

Which of the following elements are in the same group as phosphorus?

Accepted Answer

arsenic

Question 28

Which rule is violated?

Accepted Answer

Aufbau Principal

Question 29

This is the electron configuration for

Accepted Answer

carbon

Question 30

This scientist is credited with discovering the electron by using a cathode ray.

Accepted Answer

Thompson

Question 31

In the third principal energy level you will find which of the following sublevels?

Accepted Answer

s, p, and d

Question 32

Which noble gas is the most reactive?

Accepted Answer

none of these

CHEM - U2 Atomic History, Structure & Periodic Table

Questions 32

CHEM - U2 Atomic History, Structure & Periodic Table

Questions 32