Question

select the correct answer of the following in bracket to complete each sentence
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Answer 1

Answer:

1》 11. Sodium.

2》32.

3》atomic mass

4》ion

5》10

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Answer 2

1. The element is stated to have the electronic configuration as 2,8,1. This clearly indicates that the element has an atomic number 11. This means the element posses 11 protons in its nucleus. Since mass number is the sum of number of protons and neutrons, the answer is 11+12 = 23
2. The formula for maximum capacity of a shell is 2n², where n=1 for K, n=2 for L, n=3 for M. Hence answer is 2×3² = 18
3. Isotopes are elements having same atomic but different mass number, hence the answer is obviously electronic configuration
4. Ions are capable of independent existence in solutions.
5. The electronic configuration is 2,7 , hence the atomic number of the element is 9. As already mentioned in the first case, mass number is sum of atomic number(protons) and neutrons. Hence no. of neutrons = Mass number - Atomic number , that is No. of neutrons = 19 - 9 = 10

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