atoms and the periodic table

Question 1

atom

Answer 1

the smallest particle of a chemical element

Question 2

nucleus

Answer 2

the central and most important part of an object, movement, or group, forming the basis for its activity and growth.

Question 3

protons

Answer 3

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Question 4

neutrons

Answer 4

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Question 5

quarks

Answer 5

building blocks of protons and neutrons.

Question 6

democritus

Answer 6

Democritus was an Ancient Greek pre-Socratic philosopher from Abdera.

Question 7

John dalton

Answer 7

English meteorologist and chemist

Question 8

Joseph thomson

Answer 8

English physicist who helped revolutionize the knowledge of atomic structure by his discovery of the electron

Question 9

ernest rutherford

Answer 9

New Zealand physicist who was a pioneering researcher in both atomic and nuclear physics.

Question 10

Niels bohr

Answer 10

Danish physicist who is generally regarded as one of the foremost physicists of the 20th century.

Question 11

electron cloud

Answer 11

the model is a way to help visualize the most probable position of electrons in an atom

Question 12

electrons

Answer 12

The electron is a subatomic particle with a negative one elementary electric charge.

Question 13

atomic number

Answer 13

The atomic number or nuclear charge number

Question 14

Mass number

Answer 14

The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons

Question 15

Isotopes

Answer 15

Isotopes are distinct nuclear species of the same chemical element.

Question 16

Average atomic mass

Answer 16

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

Question 17

Dmitri Mendeleev

Answer 17

a Russian chemist known for formulating the periodic law and creating a version of the periodic table of elements.

Question 18

Periodic table

Answer 18

an ordered arrangement of the chemical elements into rows and columns.

Question 19

Henry Moseley

Answer 19

an English physicist, whose contribution to the science of physics

Question 20

groups

Answer 20

There are 18 numbered groups in the periodic table

Question 21

Electron dot diagram

Answer 21

Electron dot diagrams are diagrams in which the valence electrons of an atom are shown as dots distributed around the element’s symbol.