Chemistry, 02.08.2019 22:40 Babybeast3544

Which element has six valence electrons in each of its atoms in the ground state? (1)se (2)as (3)kr (4)ga

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Answer is: selenium (Se).
1) electron configuration: ₃₄Se 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4sp⁴.
2) ₃₃As 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4sp³.
3) ₃₆Kr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4sp⁶.
4) ₃₁Ga 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4sp¹.
Valence electrons of selenium are 4s²4sp⁴.

Answer from: asiamuhammad6

Answer : The correct option is, (1) Se

Explanation :

Electronic configuration : It is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom are determined by the electronic configuration.

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

(1) The given atom is, selenium (Se)

Atomic number of Se = 34

Number of electrons = 34

The electronic configuration of selenium atom is,

$1s^22s^22p^63s^23d^{10}4s^24p^4$

Number of valance electrons = 6

(2) The given atom is, arsenic (As)

Atomic number of As = 33

Number of electrons = 33

The electronic configuration of arsenic atom is,

$1s^22s^22p^63s^23d^{10}4s^24p^3$

Number of valance electrons = 5

(3) The given atom is, krypton (Kr)

Atomic number of Kr = 36

Number of electrons = 36

The electronic configuration of krypton atom is,

$1s^22s^22p^63s^23d^{10}4s^24p^6$

Number of valance electrons = 8

(4) The given atom is, gallium (Ga)

Atomic number of Ga = 31

Number of electrons = 31

The electronic configuration of gallium atom is,

$1s^22s^22p^63s^23d^{10}4s^24p^1$

Number of valance electrons = 3

Hence, from this we conclude that the selenium element has six valence electrons in each of its atoms in the ground state.

Answer from: Quest

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

Answer from: Quest

2b2t

explanation:

2b2t

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Which element has six valence electrons in each of its atoms in the ground state? (1)se (2)as (3)kr...

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