Question

the atomic number of Na and Ca are 11 and 20 respectively what will be the number of electrons in an Na+ and Ca2+​

Answer 1

Answer:

The atomic number and mass number of sodium are 11 and 23 respectively.

This suggests that number of proton in sodium =11 and number of nucleons i.e. proton and neutrons in sodium =23. Thus, number of neutrons =12 and also Since no. of protons = no. of electrons =11

So, they are similar

Answer 2

The atomic number of sodium is 11. It has 11 electrons. It loses one electron to form sodium ion. Then the number of electrons in sodium ion is 11−1=10.

The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.

I hope this helps you

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