which of the following electron configurations represents an element with similar chemical properties to an…
which of the following electron configurations represents an element with similar chemical properties to an element with the electron configuration of 1s²2s¹?\n1s²2s²2p⁵\n1s²2s²2p⁶\n1s²2s²2p⁶3s²3p⁵\n1s²2s²2p⁶3s²3p⁶4s¹\n1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶
Answer
Explanation:
Step1: Understand the key - outer electron configuration
Elements with similar chemical properties have similar outer - shell electron configurations. The given electron configuration $1s^{2}2s^{1}$ has 1 electron in its outermost shell (the 2s orbital).
Step2: Analyze each option's outer - shell electrons
- For $1s^{2}2s^{2}2p^{5}$, the outer - shell has 7 electrons ($2s^{2}2p^{5}$).
- For $1s^{2}2s^{2}2p^{6}$, the outer - shell has 8 electrons ($2s^{2}2p^{6}$).
- For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$, the outer - shell has 7 electrons ($3s^{2}3p^{5}$).
- For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$, the outer - shell has 1 electron ($4s^{1}$), which is similar to the given configuration's outer - shell electron count.
- For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}$, the outer - shell has 8 electrons ($4s^{2}4p^{6}$).
Answer:
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$