Isobars are the atoms of:

Consider the following stetements in reference to the structure of atom 1. Isopes are the atoms of the same element having same atomic number but different mass - numbers . 2. Isobars are the atoms of different elements having different atomic number of different atomic number but same mass - number . Which of above statement is/are correct ?

Which of the following is/are correct ? (I) Density of all the nuclei is same. (II) Heavy elements exhibit radioactivity. (III) Amongst alpha, beta and gamma rays, alpha -particle has minimum penetrating power. (IV) Isobars are the atoms of same elements having the different mass number.

Isobars have

Isobars are atoms of..........Which have same............... But different .............. .

Assertion : Isobars are the element having same mass number but different atomic number. Reason : Neutrons and protons are present inside nucleus