Name: Composition of Nucleus
Uploaded: 2019-07-19
Duration: 1 min 54 s
Description: The atomic nucleus is the small, dense region of protons and neutrons at the centre of an atom. Here we will study the composition of the nucleus.

Question

Complete the table below by identifying A, B, C, D, E and F.

Element	Symbol	Number of protons	Number of neutrons	Number of electrons
Fluorine	₉F¹⁹	9	A	B
Aluminium	C	D	14	13
Potassium	₁₉K³⁹	E	F	19

Accepted Answer

Element Symbol Number of protons Number of neutrons Number of electrons

Fluorine ₉F¹⁹ 9 A B

Aluminium C D 14 13

Potassium ₁₉K³⁹ E F 19

A symbol of an element is represented as _atomic_numberX^mass^number

The number of protons present in the nucleus of an atom is known as the Atomic number. An electrically neutral atom has an equal number of protons and electrons. An atom is electrically neutral because the number of protons and the number of electrons present in it are the same, thus balancing the total charge of the atom.

Therefore, the atomic number of aluminium atom (neutral atom) $=$ Number of protons (D) $=$ number of electrons $= 13$

Atomic mass or mass number $=$ Number of protons $+$ Number of neutrons

Therefore, the mass number of aluminium $=$ D $+ 14 = 27$

Therefore, C $=$ ${}_{13}{Al}^{27}$

Number of neutrons $=$ Atomic mass or mass number $-$ Number of protons

Thus, the number of neutrons in the given fluorine atom (A) $= 19 - 9 = 10$

The atomic number of potassium atom (given) $= 19 =$ Number of protons (E) $=$ Number of electrons (given)

Thus, the number of neutrons in the given potassium atom (F) $=$ Mass number of potassium $-$ The number of protons (E) or atomic number of potassium(given) $= 39 - 19 = 20$

Thus, A, B, C, D and F are given in the table as follows:

Element Symbol Number of protons Number of neutrons Number of electrons

Fluorine ₉F¹⁹ 9 10 9

Aluminium ₁₃A1²⁷ 13 14 13

Potassium ₁₉K³⁹ 19 20 19

Complete the table below by identifying A, B, C, D, E and F.

Element Symbol Number of protons Number of neutrons Number of electrons

Fluorine ₉F¹⁹ 9 A B

Aluminium C D 14 13

Potassium ₁₉K³⁹ E F 19

Important Questions on Atomic Structure

Learn and Prepare for any exam you want !

Complete the table below by identifying A, B, C, D, E and F. Element Symbol Number of protons Number of neutrons Number of electrons Fluorine 9F19 9 A B Aluminium C D 14 13 Potassium 19K39 E F 19

Important Questions on Atomic Structure

Learn and Prepare for any exam you want !

Complete the table below by identifying A, B, C, D, E and F.

Element Symbol Number of protons Number of neutrons Number of electrons

Fluorine ₉F¹⁹ 9 A B

Aluminium C D 14 13

Potassium ₁₉K³⁹ E F 19