isotopes and isobars

atomic number o an element is the same as the number of -------------- in the nucleus of the atom

• electron

• proton

• neutron

the atomic number is denoted by the letter (a)  

If Z=3 , what would be the valency of the element?

• 3

• 2

• 1

• 0

---------------------------- is defined as the number of protons present in the nucleus of an atom

(a)  

-------------------number is defined as the sum of the total number of protons and neutrons present in the nucleus of the atom

• mass

• atomic

• weight

Protium , deuterium , tritium are the isotopes of--------------

• helium

• hydrogen

• carbon

--------------are defined as the atoms of the same element,having the same atomic number but different mass numbers

• isotopes

• isobars

-------------------occurs in nature in two isotopic forms , with masses 35u and 37u

• sulphur

• chlorine

• argon

• hydrogen

isotope of -------------------- is used in the treatment of cancer

• uranium

• iodine

• cobalt

atoms of different elements with different atomic numbers and same mass number , are known as----------

• isotopes

• isobars