Chapter 4

Question 0

The______ and the ______are the subatomic particles found in the nucleus.

Answer 0

Protons, neutrons

Question 1

The smallest sub atomic particle is the _______. it has a ________charge.

Answer 1

Electron, negative

Question 2

The______ has a positive charge.

Answer 2

Proton

Question 3

The_____ has no charge.

Answer 3

Neutron

Question 4

The smallest particle of an element that retains the properties of that element is a(n)________.

Answer 4

Atom

Question 5

The mass number is the sum of the number of the _______ _______and for the number of______.

Answer 5

Atomic number, neutrons

Question 6

The number of _______equals the number of______. Otherwise the Adam would be a charged particle.

Answer 6

Electrons, protons

Question 7

All atoms of the same element have the same number of_______.

Answer 7

Protons

Question 8

Isotopes of an element have a different number of,______ but the same number of _____and_______.

Answer 8

Neutrons, protons and electrons

Question 9

The number of neutrons is calculated by _________the______ _______from the______ _______.

Answer 9

Subtracting, atomic number, mass number

Question 10

The mass number will be a _______number, while the atomic mass will be a _______number.

Answer 10

Whole, decimal

Question 11

True or false?

The nucleus has a positive charge.

Answer 11

True

Question 12

True or false?

Atoms of the same element (a.k.a. isotopes) have different mass numbers.

Answer 12

True

Question 13

True or false?

In the Rutherford or nuclear model of the atom, atoms are mostly empty space.

Answer 13

True

Question 14

True or false?

Atoms of isotopes of an element have different numbers of protons.

Answer 14

False

Question 15

True or false?
The reason JJ Thompson reasons that electrons must be part of the atoms of all elements was because the charge to mass ratio of the electrons was the same, regardless of the gas used or material used as the anode or cathode

Answer 15

True

Question 16

True or false?
Atoms are neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons.

Answer 16

False

Question 17

True or false?

Atoms are neutral with the number of protons equaling the number of electrons.

Answer 17

True

Question 18

True or false?
Chemists use the relative masses of atoms compared to C-12 rather than the actual masses of the atoms because the actual masses of atoms are very small and difficult to work with.

Answer 18

True

Question 19

True or false?
Chemists use the relative masses of atoms compared to a reference isotope rather than the actual masses of the atoms because the number of the sub atomic particles in atoms of different elements varies.

Answer 19

False

Question 20

True or false?

The atomic mass of an element is the average of the mass number and the atomic number for the element.

Answer 20

False

Question 21

True or false?

The atomic mass of an element is the weighted average of the masses of the isotopes of the element.

Answer 21

True

Question 22

What did Democritus believe about the atom?

Answer 22

Indestructible and indivisible