Question 19
Is it possible for the atom of an element to have one electron, one proton and no neutron? If so, name the element.

Q.

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(c) an atom can have only electron and proton but no neutron

(d) an atom must always have a proton, neutron and electron

Q.

(a) Name an element which does not contain a neutron.

(b) If an atom contains one electron and one proton, will it carry any charge or not?

Q. Do the Mass of electron proton and neutron of every element is same?
means for eg.hydrogen and oxygen atoms have electron proton and neutron in them..so can we say that the mass of electron proton and neutron in hydrogen and oxygen is the same..

Q.

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(c) Metal with valency 2.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.