Science, asked by mvmakshayakumar92020, 4 months ago

need answers in 1 mark

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Answered by anjali6063

2

Answer:

Q- 19/ ans : Magnesium atomic no. = 24,25,26. These are the two elements which have same atomic no.

Answered by kulsum80

2

Answer:

18. 2,6

20. 8 electrons

21. Electron

22. Helium (He)

24. Electronic Configuration = 2,8,8. Name of thevlement is Argon (Ar).

25. 2,8,2

Hope this helps you.

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