What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5
2 answers:
Answer : The position of an element in the periodic table is, Group 17 and Period 3
Explanation :
The given electronic configuration is,
Total number of electrons = 17
Number of valence electrons = 2 + 5 = 7
In the given configuration, 3 is the highest principle quantum number. Therefore, it belongs to the 3rd period in the periodic table.
If the elements belongs to the p-block then we have to determine the group number by,
Group number = Number of valence electrons + 10
Group number = 7 + 10 = 17
Hence, the position of an element in the periodic table is, Group 17 and Period 3
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Explanation:
Given,
The density of Helium is
We need to find the density in Dg/μm
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1 g = 10 dg
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So,
So, the density of Helium is equal to .
Answer:
See below
Step-by-step explanation:
(a) Shape
The formula for water is H-O-H.
The central O atom has four electron pairs around it. They try to get as far from each other as possible, so they point toward the corners of a tetrahedron.
Only two of the pairs have a hydrogen atom attached, so water has a bent shape. The H-O-H bond angle is about 104°.
(b) Chemical magnet
The O atom has a greater attraction than H for the shared electrons in the O-H bonds, so the electrons spend more time near the O.
This gives the O atom a partial negative charge (pink in the diagram) and the H atoms a partial positive charge (blue).
The water molecule acts like a chemical magnet because its negative end attracts the positive ends of other molecules, while its positive ends attract the negative ends of other molecules.
