An element X has a mass number 4 and atomic number 2. Write the valency of this element?

Academic Chemistry NCERT Class 9

Given, Mass number = 4

Atomic number = 2

The valency of the element is 0.

As the element has fulfilled its duplet and will not react with any other atom because it has its outer shell filled.

(Example: Helium).

Tutorialspoint

Simply Easy Learning

Updated on: 19-Jan-2023

9 Views

An element ‘X’ has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of ‘X’. Also write group number, period number and valency of ‘X’.
An atom has atomic number 12, what is its valency, and name the element?
(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.(b) What is the relation between the atomic number and mass number of an element?(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
An element X has a valency of 2. Write the simplest formula for:(a) bromide of the element(b) oxide of the element
Write the electronic configuration of the element with atomic number 17. Indicate the valency of the element.
The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of :(a) 1 (b) 2 (c) 3 (d) 4
‘‘Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist.’’ Take the example of the element X (atomic number 13) to justify this statement.
The atomic number of an element X is 16.(a) Write down the electronic configuration of X.(b) What will be the valency of X ?
An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X and Y?
Establish the relationship between atomic number, mass number, isotopes, isobars, and valency of an atom.
(a) Define valency of an element. What valency will be shown by an element having atomic number 14?(b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.
Which of the following elements will form an acidic oxide?(a) An element with atomic number = 7(b) An element with atomic number = 3(c) An element with atomic number = 12(d) An element with atomic number = 19
The nucleus of an atom has 5 protons and 6 neutrons. What would be the (a) atomic number, (b) mass number, (c) the number of electrons, and (d) the number of valence electrons, per atom of this element?
Atom A has a mass number 209 and atomic number 82.Atom B has a mass number 209 and atomic number 83.(i) How many protons atom A has ?(ii) How many protons atom B has ?(iii) Are atoms A and B isotopes of the same element ?
How can the valency of an element be determined if its electronic configuration is known? What will be the valency of an element of atomic number 9?

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements