Atomic number of elements A B C D E are 7 10 12 4 19. Which two elements are chemically similar. Which is an inerd gas. Which element belongs to third period of periodic table. Which element amoung this is the non metal
Answers
Answer:
inert gas=configaration 10 which is neon
non metal=7 nitrogen
chemically simillar=12 and 4 as they have same valency, ie 2 valence electrons
- C and D are chemically similar.
- B is an inert gas
- C belongs to the 3rd period
- A is a non-metal
Given:
The atomic number of 5 elements tagged as A, B, C, D, and E is 7,10,12,4,9.
To Find:
- Which of the two elements are chemically similar?
- Which element is an inert gas?
- Which of the element belongs to the 3rd period of the periodic table?
- Which element is a non-metal?
Solution:
A, B, C, D, and E elements have atomic numbers of 7,10,12,4,9.
Let us write the electronic configuration of all these elements and identify the element first.
A (AN - 7) = 1s²2s²2p³ [Nitrogen]
B (AN - 10) = 1s²2s²2p⁶ [Neon]
C (AN - 12) = 1s²2s²2p⁶3s² [Magnesium]
D (AN - 4) = 1s²2s² [Beryllium]
E (AN - 9) = 1s²2s²2p⁵ [Fuorine]
Within these,
- C and D are chemically similar. As these two falls under group 2A i.e, are alkaline earth metals. Both of them have 2 electrons in the outermost orbit.
- B is an inert gas as its outermost shell is filled completely.
- Within all these, C belongs to the 3rd period as its outermost electron lies in the 3s orbital.
- A is a non-metal, as it belongs to group 15. Whereas, Group 1 and 2 are metal in nature.
#SPJ2