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Flashcards in Periodic Table Deck (25):
1

What is a element?

A chemical element is a group of atoms having the same number of protons in thier atomic nuclei.

2

What is an atomic nucleus?

The atomic nucleus is the small, dense region consisting of protons and neutrons at the centre of an atom.

3

Who discovered the atomic nucleus and in what year?

Discovered by Ernest Rutherford in 1911.

4

What is a molecule?

A molecule is an electrically neutral group of two or more atoms held together by chemical compounds.

5

What is an atom?

An atom is the smallest unit of ordinary matter that has properties of a chemical element.

6

What is a compound?

A compound is a chemical substance composed of many identical molecules and atoms for more than one element held together by chemical bonds.

7

In a periodic table the elements are in order of?

Atomic number
Or
The number of protons in each atom

8

The elements in group 1 are known as?

Alkali metals

9

The elements in group 18 are known as?

Noble gases

10

The elements found between groups 3 and 12 are known as?

Transition metals

11

The elements in group 2 are know as?

Alkaline earth metals

12

Aluminium, Gallium, Indium, Tin, Lead, Polonium and a few others are know as what elements?

Post-transition metals

13

Boron, Silicon, Arsenic, Antimony, Germanium and two others are know as what elements?

Metalloids

14

Who formulated the periodic table?

Dimitri Mendeleev

15

What is the chemical symbol for Boron and its atomic number?

B
5

16

What is the chemical symbol of Iron and its atomic number?

Fe
26

17

What is an isotope?

An isotope is two or more forms of the same element that contain equal number of protons but different numbers of neutrons in the nucleus.

18

Elements with an atomic number from 57 to 71 are known as?

Lanthanoids

19

Elements with an atomic number between 89 and 103 are known as?

Actinoids

20

What is the symbol for Aluminium and its atomic number?

Al
13

21

What is the symbol for Manganese and its atomic number?

Mn
25

22

What is the maximum number of electrons an S shell can hold?

2

23

What is the maximum number of electrons a P shell can hold?

6

24

What is the maximum number of electrons a D shell can hold?

10

25

What is the maximum number of electrons an F shell can hold?

14