Atomic Number

Question 1

What three words describe the nucleus?

Answer 1

Small, dense, central

Question 2

What is the nucleus surrounded by?

Answer 2

Orbiting electrons in electron shells

Question 3

Why does the nucleus have an overall positive charge?

Answer 3

Consists of protons and neutrons

Question 4

Where is the mass of the atom concentrated?

Answer 4

The nucleus

Question 5

What are the relative numbers of protons and electrons in a neutral atom?

Answer 5

Same number of protons and electrons

Question 6

What is the relative mass of a neutron?

Answer 6

1

Question 7

What is the relative mass of an electron?

Answer 7

1/1840

Question 8

What is the relative mass of a neutron?

Answer 8

1

Question 9

What is the formula for calculating the maximum number of orbiting electrons than can be held by a single shell?

Answer 9

2n2

Question 10

What is the mass number?

Answer 10

The sum of protons and neutrons in an atom

Question 11

What is the atomic number?

Answer 11

The number of protons in an atom (also known as the proton number)

Question 12

How are ions formed?

Answer 12

When an atom gains or loses electrons

Question 13

Why does an ion have an overall charge?

Answer 13

It has lost or gained electrons so the charges of protons to electrons no longer cancel our

Question 14

What is an isotope?

Answer 14

Atoms of the same element with the same atomic number, but with a different number of neutrons resulting in a different mass number.

Question 15

Why do neutral atoms of isotopes react CHEMICALLY the same way?

Answer 15

They have the same proton number and the same electron configuration

Question 16

In isotopes, is the sharing and transfer of electrons affected?

Answer 16

No

Question 17

Do isotopes have different physical properties?

Answer 17

Yss

Question 18

What is relative atomic mass?

Answer 18

A weighted mean, average mass of an atom of an element relative to 1/12th of the main mass of an atom of the carbon-12 isotope.

Question 19

What is the formula for working out Ar?

Answer 19

Mean mass of an atom of an element / 1/12 x mean mass of C-12 isotope

Question 20

What is relative isotopic mass?

Answer 20

The isotopic mass of an isotope relative to 1/12 of the mean mass of an atom of carbon 12 isotope

Question 21

What Is the relative molecular mass?

Answer 21

The weighted, mean, average mass of a molecule of a compound relative to 1/12 of the main mass of an atom of the carbon-12 isotope

Question 22

How can relative molecular mass be calculated?

Answer 22

By adding together the separate Ar values of the component elements.

Question 23

When is relative formula mass used?

Answer 23

For compounds with giant structures

Question 24

What is Mass Spectrometry used for?

Answer 24

To identify different isotopes and find the overall relative atomic mass of an element.

Question 25

What type of technique is mass spectrometry?

Answer 25

Analytical

Question 26

What does Time Of Flight (TOF) mass spectrometry do?

Answer 26

Records the time it takes for ions of each isotope to reach a detector.

Question 27

What can be produced to show each isotope present?

Answer 27

A spectra

Question 28

The greater the signal produced….

Answer 28

….the greater the abundance of the isotope

Question 29

How can the Ar value be calculated from the spectra?

Answer 29

Sum of (m/z x abundance) / total abundance

Question 30

What are binary compounds? (-ide suffix)

Answer 30

They only contain two elements

Question 31

What is a poly atomic ion?

Answer 31

It contains more than one atom

Question 32

Does a mole always contain the same number of particles?

Answer 32

Yes (Na)

Question 33

What is avogadro’s constant (Na)?

Answer 33

6.02 x 10^23

Question 34

What equation links number of particles, number of moles and the constant?

Answer 34

Number of particles = n x Na

Question 35

What is the molar mass?

Answer 35

The mass per mole (g/mol)

Question 36

What is the molar gas volume?

Answer 36

The gas volume per more
(dm^3/mol)