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fomenos
3 years ago
5

What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5

Chemistry
2 answers:
OlgaM077 [116]3 years ago
4 0
The element in the periodic table with the provided electron configuration is Chlorine. Cl it is found as in element in Group 7 of the periodic table.
KengaRu [80]3 years ago
3 0

Answer : The position of an element in the periodic table is, Group 17 and Period 3

Explanation :

The given electronic configuration is, 1s^22s^22p^63s^23p^5

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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What is the mass (in grams) of 9.93 Ă— 1024 molecules of methanol (CH3OH)?
WINSTONCH [101]

Answer is: mass of methanol is 528.32 grams.

N(CH₃OH) = 9.93·10²⁴; number of methanol molecules.

n(CH₃OH) = N(CH₃OH) ÷ Na (Avogadro constant).

n(CH₃OH) = 9.93·10²⁴ ÷ 6.022·10²³ 1/mol.

n(CH₃OH) = 16.49 mol; amount of substance.

m(CH₃OH) = n(CH₃OH) · M(CH₃OH).

m(CH₃OH) = 16.49 mol · 32.04 g/mol.

m(CH₃OH) = 528.32 g.

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2 years ago
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8 0
3 years ago
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3 years ago
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