Atom Structure & Periodic Table

Question 1

What is the meaning of atomic number?

Answer 1

The number of protons in the nucleus of an atom.

Question 2

What is the meaning of electron?

Answer 2

A tiny particle with a negative charge and very little mass

Question 3

What is the meaning of electron shell?

Answer 3

Areas around a nucleus that can be occupied by electron

Question 4

What is the meaning of group?

Answer 4

A vertical column of elements in the periodic table

Question 5

What is the meaning of isotope?

Answer 5

Atoms of an element with the same number of protons but different mass numbers due to different numbers of neutrons.

Question 6

What is the meaning of mass number?

Answer 6

The total number of protons and neutrons in the the nucleus of an atom.

Question 7

What is the meaning of neutron?

Answer 7

A particle found in the nucleus of an atom having zero charge and mass of 1

Question 8

What is the meaning of period?

Answer 8

Rows of the periodic table

Question 9

What is the meaning of proton?

Answer 9

A particle found in the nucleus of an atom, having a positive charge and the same mass as a neutron.

Question 10

What is the meaning of subatomic particle?

Answer 10

A particle that is smaller than an atom, such as a proton, neutron or electron.

Question 11

What is the relative atomic mass of an atom that contains 12 protons, 14 neutron and 12 electrons?

Answer 11

26

Question 12

Sodium contains 11 electrons. What is the electronic structure of sodium?

Answer 12

2, 8, 1

Question 13

Which of these is an element?
O2
CO2
O

Answer 13

O

Question 14

Properties of metals

Answer 14

Good conductors
High melting and boiling points
All except 1 are solids

Question 15

What is the maximum number of electrons that can be in the inner shell?

Answer 15

2

Question 16

Name the three isotopes of hydrogen

Answer 16

Protium
Tritium
Deuterium

Question 17

Which isotope of hydrogen is the most common?

Answer 17

Protium

Question 18

How many neutrons does deuterium have?

Answer 18

1

Question 19

What term is given to a specific nucleus that contains a certain number of protons and neutrons?

Answer 19

Nuclide

Question 20

How many subatomic particles are there?

Answer 20

3

Question 21

Types of subatomic particles

Answer 21

Neutron
Electron
Proton

Question 22

What was the first English physicist called who discovered electrons in 1897?

Answer 22

JJ Thomson

Question 23

What was the name of the atomic model devised by JJ Thomson?

Answer 23

Plum Pudding Model

Question 24

Who was the physicist in 500 B.C, and what was his theory?

Answer 24

Demoncritus

Atoms make up everything

Question 25

Who was the physicist in 1800’s and what was his theory?

Answer 25

John Dalton

Atoms are spheres

Question 26

What was JJ Thomson’s theory?

Answer 26

Atoms contain positive charge

Question 27

Who was the physicist in 1909 and what was his theory?

Answer 27

Ernest Rutherford

Alpha particles could bounce back off atoms

Question 28

Who was the physicist in 1913 and what was his theory?

Niels Bohr

Answer 28

Electrons orbit the nucleus in the shells

Question 29

What conclusions did Ernest Rutherford draw from his discovery?

Answer 29

Nucleus contains positively charged particles

Question 30

Who was the physicist in 1913 and what was his theory?

Chadwick

Answer 30

Neutrons have no charge in the nucleus

Question 31

Who was the first scientist to leave gaps for undiscovered elements in his version of the periodic table?

Answer 31

Dmitri Mendeleev

Question 32

What discovery proved Mendeleev’s periodic table to be correct and Newland’s be wrong?

Answer 32

The discovery of protons and isotopes