Which of the following is an isoelectronic series? F-, Cl-, Br-,I- O2- ,F- ,Ne, Na+ S, Cl, Ar, K Si2- ,P2-, S2-, Cl2-
Monica [59]
Answer:
(b) O²⁻,F⁻ ,Ne, Na⁺
Explanation:
An isoelectronic series is a sequence of atoms/ions with the same electron configuration.
(a) F⁻, Cl⁻, Br⁻, I⁻
F⁻: [He] 2s²2p⁵
Cl⁻: [Ne] 3s²3p⁵
Br⁻: [Ar] 4s²4p⁵
I⁻: [Kr] 5s²5p⁵
The ions all have different electron configurations. Not isoelectronic.
(b) O²⁻,F⁻ ,Ne, Na⁺
O²⁻: [Ne]
F⁻ : [Ne]
Ne: [Ne]
Na⁺: [Ne]
The species all have the same electron configuration. Isoelectronic.
(c) S, Cl, Ar, K
S: [Ne] 3s²3p⁴
Cl: [Ne] 3s²3p⁵
Ar: [Ar]
K: [Ar] 4s
The atoms all have different electron configurations. Not isoelectronic.
(d) Si²⁻ ,P²⁻, S²⁻-, Cl²⁻
Si²⁻: [Ne] 3s²3p⁴
P²⁻: [Ne] 3s²3p⁵
S²⁻: [Ar]
Cl²⁻: [Ar] 4s
The ions all have different electron configurations. Not isoelectronic.
Answer:
option B
Explanation:
A spontaneous reaction drive favorable when enthalpy is decreasing and the entropy is increasing on the system. If that happens the reaction occurs spontaneously
6.3 ×
In scientific notation, the numerical value without the exponent of 10 must be within the range from 1 to just below 10 (for example, 9.99...). In this case, 6.3 is already within this range, so we just have to multiply it by 1. To get a multiplier of 1 using base 10, we would have to raise 10 to the zeroth power.