XPERIMENT 3 uc before lab begins. Answer in the space provided. 1. Write electro

Question

XPERIMENT 3 uc before lab begins. Answer in the space provided. 1. Write electron configuration for the alkali metals Li, Na, K, and Rb Li Rb 2. Write the electron configuration for strontium and the strontium(Il) ion. Sr2* 3. Name the colors in visible light, beginning with that of highest energy (shortest wavelength). 4. What is the maximum number of electrons the irst four energy levels can hold? n-2- What is monochromatic light? Light of one color Light of a siNgle navelength 5. HEM 1405 Experiment 3

Explanation / Answer

1.

Li= 3 = 1s2 2s1

Na= 11= 1s2 2s2 2p6 3s1

K= 19 = 1s2 2s2 2p6 3s2 3p6 4s1

Rb= 37 = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

2)

Strontium = Sr= 38 = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2

Strontium ion = Sr+2 = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

3)

Vilolet, Indigo, Blue. Green . Yellow. Orange and Red.

Violet has more energy and less wave length

Red has low energy and more wave length

4)

The number of electrons present in an orbit is calculated as 2n2

n=1 = 2(1)2= 2

n= 2 = 2(2)2 = 8

n=3 = 2(3)2 = 18

n=4= 2(4)2 = 32 electrons

5) The light which has same wavelength will show only a single colour and this will be the monochromatic ligth

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