From Quiz 2

Question 1

Who proposed that everything was made of tiny particles, called “atomos”, surrounded by empty space?

Answer 1

Democritus

Question 2

believed that compounds were combinations of atoms from different elements that could not be created or destroyed

Answer 2

John Dalton

Question 3

J.J Thompson won a Nobel prize for his discovery of

Answer 3

Electrons

Question 4

J.J Thomson…

A Believed the atom was a sphere of positive matter packed with negative electrons
B. Believed there that matter contained 4 elements-earth, fire, wind, and water
C. Believed that matter is composed of space

Answer 4

A

Question 5

Who is famous for the gold foil experiment?

Answer 5

Ernest Rutherford

Question 6

Ernest Rutherford showed atoms…

Answer 6

Have a dense nucleus

Question 7

What scientist was the first to conclude through experimentation that atoms have positive charges in their nuclei

Answer 7

Rutherford

Question 8

Atoms of the same element must

Answer 8

Contain the same number of protons

Question 9

An increase in atomic number is related to an increase in atomic mass because

Answer 9

More protons are present in the atomic nucleus

Question 10

Which of these conclusions can be drawn from Rutherford’s experiment?
A Each atom contains electrons.
B. The nucleus of an atom can be split.
C. Each atom contains protons.
D. Atoms are mostly empty space

Answer 10

D

Question 11

The two main parts of an atoms are its

Answer 11

Nucleus and electron energy levels

Question 12

The number of orbitals in the second principle energy level of an atom (n=2) is:

Answer 12

4

Question 13

Orbitals are not occupied by:
A. 0 electron
B. 1 Electron
C. 2 Electrons
D. 3 Electrons

Answer 13

D

Question 14

Which sublevel can be occupied by a maximum of 10 electrons

Answer 14

d

Question 15

The atomic mass is, which of the following added together

Answer 15

Protons+Neutrons

Question 16

An atom which has a charge due to losing or gaining electrons is called a/an

Answer 16

Ion

Question 17

What three numbers are always the same in the neutral atom

Answer 17

Atomic number, protons and electrons

Question 18

According to atomic theory electrons are usually found

Answer 18

Outside the nucleus and often far from it of - most of an atoms volume is its electron cloud

Question 19

If you want to know which atom and element is then count then count the

Answer 19

Protons

Question 20

When you change the number of electrons of an atom, you produce a different

Answer 20

Ion

Question 21

Changing the number of neutrons of an atom changes its

Answer 21

Isotope

Question 22

Which particles have approximately the same size and mass of each other

Answer 22

Protons and neutrons

Question 23

The three basic components of an atom are

Answer 23

Protons, neutrons and electrons

Question 24

Atoms of the same element with different mass numbers are called

Answer 24

Isotopes

Question 25

How do you determine the charge of an ion?

Answer 25

It is equal to the number of protons minus the number of electrons

Question 26

In the name carbon 14 the 14 is the

Answer 26

Mass number

Question 27

The density of dots in a region represents the probability density, of finding electrons in the region. The probability which of density plots of 1s and 2s orbitals are given in Fig. On the basis of below diagram the following statements is incorrect? A. 1s and 2s orbitals are spherical in shape. B . The probability of finding the electron is maximum near the nucleus. C. The probability of finding the electron at a given distance is equal in all directions D. The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.

Answer 27

D

Question 28

The total number of orbitals associated with third shell (3rd energy level) will be

Answer 28

9

Question 29

The presence of one electron in each of the three 2p sub-shell of nitrogen is explained by

Answer 29

Hund’s rule

Question 30

Boron and aluminum are both in Group IIIA of the periodic table Which statement is true for these two elements? A. Both elements are metals. B. Both elements form acidic oxides. C. Both elements contain 3 electrons in the outermost shells. D. Both elements have the same number of protons

Answer 30

C

Question 31

The _ tells you how many valence electrons an element has

Answer 31

Group number

Question 32

Which sublevel can be occupied by maximum of 14 electrons

Answer 32

f

Question 33

In order to an atom to be neutral what has to be TRUE? A The atom has more protons than neutrons B. The atom has more neutrons than protons. C. The atom has the same number of protons and electrons D. The atom has the same number of protons and neutrons

Answer 33

Cy

Question 34

The numbered row of the periodic table tells you how many _ an atom of the element has

Answer 34

Energy level

Question 35

Aufbau’s principle states that

Answer 35

Electrons in their ground state will occupy orbitals in order of their energy level. The lowest energy levels are always filled first.

Question 36

Which electronic configuration represents Chromium? (atomic number=24) A. 1s2 2s2 2p6 3s2 3p 3d 4s 4p3 B. 1s2 2s2 2p6 3s2 3p 3d 4s² C. 1s 2s2 2p 3s2 3p 3d 4s¹ D. 1s2 2s2 2p6 3s2 3p6 4s2 3d4

Answer 36

D

Question 37

What is the valence shell of this atom with this electron configuration? 1s2 2s2 2p6 3s2 3p 4s² 3d10 4p 5s² 4d10 5p4

Answer 37

5s2 5p4

Question 38

Hund's rule states A. Atomic orbitals have opposite spins and 2 electrons each. B. Electrons occupy orbitals of highest energy first and energy level changes as you go up. C. Electrons occupy orbitals of lowest energy first, starting with 1s. D. Electrons occupy orbitals of equal energy, one electron enters each orbital one at a time until orbitals of the entire energy level have one electron with the same spin,

Answer 38

Electrons occupy orbitals of equal energy, one electron enters each orbital one at a time until orbitals of the entire energy level have one electron with the same spin,

Question 39

What is Pauli exclusion principle? A. An atomic orbital can only hold a maximum of 2 electrons, each with opposite spins. B. An atomic orbital can only hold a maximum of 6 electrons, each with opposite spins C.An atomic orbital can hold a minimum of 2 electrons, each with opposite spins. D. An atomic orbital can hold a minimum of 6 electrons, each with opposite spins

Answer 39

An atomic orbital can only hold a maximum of 2 electrons, each with opposite spins.

Question 40

Which family of elements does not form ions or bonds with other elements

Answer 40

Noble gases