Atomic Number and Mass Number

Isobars are atomic species that have the same _____ number, but a different atomic number.

Properties of Isobars: Isobars of an element have the same number of _____ .

Why isobars have different physical properties?

What are the properties of isobars?

If you know the mass number and the atomic number of an atom, how might you calculate its number of neutrons? 

The atoms of any element have the same atomic number but a different mass number are called -

Which of the following atomic species are isobars?

${}_{90}{}^{231}\mathrm{Z}, {}_{91}{}^{230}\mathrm{Z}, {}_{88}{}^{230}\mathrm{Z}, {}_{90}{}^{233}\mathrm{Z}$

Write the electronic configurations of any one pair of isobar.

Why isobars have different chemical properties?

Define isobar.

Define isotopes.

Write the definition of mass number.

Write the definition of atomic number.

Write the names of three isotopes of hydrogen.

The nucleus of an atom has its mass.

Isobars have different physical and chemical properties.

Give reasons.

 Isotopes of an element have the same atomic numbers.

What is a periodic table?

Protons and neutrons are collectively called as;  

Elements arranged in each group of periodic table have the same number of valence electrons.