Question

Indicate the elements which belong to the same group from their atomic numbers given : 9, 17, 24, 30, 35, 45.

Answer 1

Atomic no.-9- Fluorine

17- Chlorine

24- Chromium

30-Zinc

35- Bromine

45-Rhodium

But only 9,17 and 35 belong to the same group

Answer 2

Elements with atomic numbers 9, 17, and 35 belong to the same group.

Explanation:

Elements present in the same group will have same number of valence electrons.

Atomic number of fluorine is 9, it means that it has 9 protons and 9 electrons. $F:9:1s^22s^22p^5$

Atomic number of chlorine is 17, it means that it has 17 protons and 17 electrons. $P:17:1s^22s^22p^63s^23p^5$

Atomic number of magnesium is 24, it means that it has 24 protons and 24 electrons. $Cr:1s^22s^22p^63s^23p^64s^13d^5$

Atomic number of zinc is 30, it means that it has 30 protons and 30 electrons. $Zn:30:1s^22s^22p^63s^23p^64s^23d^{10}$

Atomic number of bromine, it means that it has 35 protons and 35 electrons. $Br:35:1s^22s^22p^63s^23p^64s^23d^{10}4p^5$

Atomic number of zinc is 45, it means that it has 45 protons and 45 electrons. $Rh:45:1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^14d^8$

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