An atom having atomic mass number 13 has 7neutrons. What is the atomic number of the atom?

What is the atomic number of nitrogen?

What is the atomic number of hydrogen?

What is atomic mass unit?

The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it ? What is the atomic number of the element ?

The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it ? What is the atomic number of the element ?

An atom has electronic configuration 2,8,7. What is the atomic number of this elements?

Which has minnimum number of oxygen atom ?