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

An element has atomic number 10 and an atomic mass of 22. Write the symbol of element. Find the number of neutron in it.

An element has atomic number 10 and an atomic mass of 22. Write the symbol of element. Find the number of electron and proton in it.

(a) What is mean 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 ?

Calculate the atomic number of an element whose atomic nucleus has mass number 23 and neutrin number 12. What is the symbol of the element ?

Write the electronic configuration of the element with atomic number 17. Indicate the valency of the element.

Write the electronic configuration of the element with atomic number 17. Indicate the valency of the element.

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 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 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'.