Question

name: date: period: version b
part 1
unit quiz 2a - electronic structure
complete the table below by filling in the missing information. all elements in the table are neutral.
give the full electron configuration for elements with less than 18 electrons.
give the noble gas electron configuration for elements with more than 18 electrons.

element symbol	total number of electrons	electron configuration	number of valence electrons	lewis dot structure
		1s²2s²2p⁶3s²3p³		-
				•as•

part 2
in the box to the right, construct the lewis dot structure of the neutral element with an electron - configuration of 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p².
| lewis dot structure |
| ---- |

Explanation:

Step1: Determine electrons for Al

Al (aluminum) has an atomic number of 13, so the total number of electrons is 13.

Step2: Write electron - configuration for Al

The full electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$.

Step3: Find valence electrons for Al

The outermost shell electrons are valence electrons. For Al, in the 3s and 3p sub - shells, there are 2 + 1=3 valence electrons.

Step4: Analyze given electron - configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$

The total number of electrons is 2 + 2+6 + 2+3 = 15. The element with 15 electrons is P (phosphorus). It has 5 valence electrons (3s²3p³).

Step5: Analyze Lewis dot structure of As

As (arsenic) has 5 valence electrons. The Lewis dot structure shows 5 dots around the symbol As.

Step6: Analyze given electron - configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{2}$

The total number of electrons is 2+2 + 6+2+6+2+10+6+2+10+2 = 50. The element with 50 electrons is Sn (tin). It has 4 valence electrons (5s²5p²), and the Lewis dot structure has 4 dots around the Sn symbol.

ELEMENT SYMBOL	TOTAL NUMBER OF ELECTRONS	ELECTRON CONFIGURATION	NUMBER OF VALENCE ELECTRONS	LEWIS DOT STRUCTURE
P	15	$1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$	5	$\cdot$P$\cdot$<br>$\cdot$
As	33	-	5	$\cdot$As$\cdot$
Sn	50	$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{2}$	4	$\cdot$Sn$\cdot$

Answer:

ELEMENT SYMBOL	TOTAL NUMBER OF ELECTRONS	ELECTRON CONFIGURATION	NUMBER OF VALENCE ELECTRONS	LEWIS DOT STRUCTURE
P	15	$1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$	5	$\cdot$P$\cdot$<br>$\cdot$
As	33	-	5	$\cdot$As$\cdot$
Sn	50	$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{2}$	4	$\cdot$Sn$\cdot$