Five atoms are labelled from A to E
Atoms Mass No Atomic Number A 40 20 B 19 9 C 7 3 D 16 8 E 14 7
Which one of these atoms:
(i) contain 7 protons
(ii) has an electronic configuration of 2,7 ?
Five atoms are labelled from A to E
| Atoms | Mass No | Atomic Number |
| A | 40 | 20 |
| B | 19 | 9 |
| C | 7 | 3 |
| D | 16 | 8 |
| E | 14 | 7 |
Which one of these atoms:
(i) contain 7 protons
(ii) has an electronic configuration of 2,7 ?
Atoms Mass No. Atomic No. Electronic configuration Name of the element
A 40 20 2,8,8,2 Calcium
B 19 9 2,7 Fluorine
C 7 3 2,1 Lithium
D 16 8 2,6 Oxygen
E 14 7 2,5 Nitrogen
Atomic Number = The elements are arranged in order of increasing the number of protons in the nucleus.
Atomic no. = Total number of protons
Mass Number - The number of protons and neutrons combine to give us the mass number of an atom.
Mass no. = No. of protons + No. of neutrons
(i) Contains 7 protons – Nitrogen (E)
(ii) has an electronic configuration 2,7 – Fluorine (B)
Atoms Mass No. Atomic No. Electronic configuration Name of the element
A 40 20 2,8,8,2 Calcium
B 19 9 2,7 Fluorine
C 7 3 2,1 Lithium
D 16 8 2,6 Oxygen
E 14 7 2,5 Nitrogen
Atomic Number = The elements are arranged in order of increasing the number of protons in the nucleus.
Atomic no. = Total number of protons
Mass Number - The number of protons and neutrons combine to give us the mass number of an atom.
Mass no. = No. of protons + No. of neutrons
(i) Contains 7 protons – Nitrogen (E)
(ii) has an electronic configuration 2,7 – Fluorine (B)
