Question

21. The postulate that all atoms of an element are exactly alike was proved wrong with
the discovery of
1 ratioactivity 2) allotropy
3) isotopes
22. FCI and HCl differ from each other in number of
1) electrons
2) mesons
3) protons
4) nucleons
23. Which of the following has more electrons than neutrons ?
4) isobars
1)
3) -
24. Isotones have same
1) atomic number 2) mass number 3) number of neutrons 4) number of electrons.
25. Two nuclides X and Y are isotonic to each other with mass numbers 70 and 72
respectively. If the atomic number of X is 34, then that of Y would be
2) 34
3) 36
26. An isotone of Geis
1) G
21 AS
3) se
4)
27. Ne, Na and Fhave the same
1) mass number 2) number of nucleons 3) number of electrons 4) number of protons​

Answer 1

Isotopes neutrons isobars number of electrons