Question

question 25 10 points match the electron configuration on the left with the element or ion on the right. place the letter corresponding electron configuration next to the correct element or ion. prompts answers ① 1s²2s²2p⁶3s²3p⁵ select match ② 1s²2s²2p⁶3s²3p⁶ select match ③ 1s²2s²2p⁶3s²3p⁶4s¹ select match ④ 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ select match ⑤ 1s²2s²2p⁶ select match question 26 10 points

Explanation:

1. For the electron - configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$, the total number of electrons is $2 + 2+6 + 2+5=17$. Chlorine (Cl) has 17 electrons, so it matches Cl.
2. For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$, the total number of electrons is $2+2 + 6+2+6 = 18$. Argon (Ar) is a noble - gas with 18 electrons, so it matches Ar.
3. For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$, the total number of electrons is $2+2 + 6+2+6+1 = 19$. Potassium (K) has 19 electrons, so it matches K.
4. For $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$, the total number of electrons is $2+2 + 6+2+6+2 + 10+5=35$. Bromine (Br) has 35 electrons, so it matches Br.
5. For $1s^{2}2s^{2}2p^{6}$, the total number of electrons is $2+2 + 6 = 10$. Neon (Ne) is a noble - gas with 10 electrons, so it matches Ne.

Answer:

1. Cl
2. Ar
3. K
4. Br
5. Ne