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Why is the mitochondria called the powerhouse of the cell?
If the number of electrons in an atom is 8 and number of protons is also 8, then
(i) What is the atomic number of the atom?
(ii) What is the charge on the atom?
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
Name the three subatomic particles of an atom.
What are the canal rays? And what is its use ??
Number of valence electrons in Cl– ion are:
(a) 16
(b) 8
(c) 17
(d) 18