Question

which of the following would you put in box c? * (0.5 points) 1 $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$ 2 $1s^{2}2s^{2}2p^{4}$ 3 $1s^{2}$ 4 $xe6s^{2}4f^{4}$ 5 $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}$ 6 $ne3s^{2}$

Explanation:

Step1: Identify the block of box C

Box C is in the p - block. Elements in the p - block have their outermost electrons in p orbitals. The general electron configuration for p - block elements (except for He) has the form \(ns^{2}np^{x}\) (\(n\geq2\)).

Step2: Analyze each option

• Option 1: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\). The last - filled orbital is \(4p\), so it is a p - block element.
• Option 2: \(1s^{2}2s^{2}2p^{4}\). The last - filled orbital is \(2p\), but let's check the position.
• Option 3: \(1s^{2}\) is \(He\), which is usually placed separately (sometimes considered as s - block but in a special position).
• Option 4: \([Xe]6s^{2}4f^{4}\) is an f - block element (from the \(4f\) filling).
• Option 5: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}\) is a d - block element (last - filled orbital is \(3d\)).
• Option 6: \([Ne]3s^{2}\) is an s - block element (last - filled orbital is \(3s\)).

Answer:

1. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\)