Question

Choose from the table letters (A to E) that represent
(a) a pair of isotopes.
(b) an element with mass number 19.
(c) an element having atomic number 7. Element Neutron Proton Electron
А 22 18 18
B 18 17 17
C 10 9 9
D 7 7 7
E 20 17 17​

Answer 1

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a. B and E

b. C

c. Nitrogen