Question

Bohr models of atoms A,B,C are given (symbols are not real) (a) write the atomic number,mass number and electronic configuration of the atoms.(b) among these, which are isotopes? Why?​

Answer 1

Answer:

(a)Atomic number = 19

Number of protons = Number of electrons = 19

Mass number = Number of protons + Number of neutrons

39 = 19 + N

N = 20

Electronic configuration

19 = (2, 8, 8, 1)

Electrons in K shell (1st) = 2

Electrons in L shell (2nd) = 8

Electrons in M shell (3rd) = 8

Electrons in N shell (4th) = 1

Valence electrons is the number of electrons in the outer shell, i.e. 1 in this atom.

(b)An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Answer 2

Answer:

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