What is the atomic number of Helium?

Radioisotope carbon-14 is a beta -emitter. What is the atomic number of the daughter element ?

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

What is atomic number?

What is atomic number?

(i) The electronic configuration of an atom is [Z](n-2) f^(14)(n-1)d^(1)ns^(2) . What is the minimum position of the atom in the periodic table and correspondingly what is the atomic number of Z? (ii) Find the number of unpaired electrons in the atom of the element having atomic number 16. (iii) Which of the following ions does not obey Bohr's atomic theory? He^(2+),Li^(2+),B^(3+),Be^(3+) .

What is the number of helium atoms in 1 mole He?

What would be the atomic number of the next halogen if discovered in future-

What is the coordination number of each atom in HCP and CCP structures?