Question

An atom of an element is represented as
39/19
What does value 39 indicate?
II. What does value 19 indicate?
III. What is the number of protons in X?
IV. What is the number of electrons in X?
V. What is the number of neutrons in X?
VI. Give the electronic configuration of element X.
VII. State the valence electrons in X.
VIII. Is element X metal or non-metal?
IX. Write the position of X in the periodic table with respect to group and period.

Answer 1

Explanation:

No. of Neutrons = Mass No. - Atomic No

= 39 - 19

=20

Answer 2

Explanation:

1)39 is the mass number

2)19 is the atomic number

3) and 4) the number of protons in X will be equal to the number of electrons or the atomic number which is equal to 19 so the number of protons and elecrons is equals to 19

5)number of neutrons equals to mass number - atomic number which is equal to 39 - 19 is equal to 20

6)2,8,8,1 or 1s ² 2s² 2p⁶ 3s² 4p⁶ 4s¹

7)1

8) since the electronic configuration of the element is 2881 and the last or the valence electron is one that means that will need to donate an its electron to achieve a stable state so it is metal

9) group 1 period 3