Give electron configurations for atoms of these elements na k i ne

The answer for the electronic configuration of the following elements are listed below:

1.Na (Sodium) - 1s2 2s2 2p6 3s1.

2.K (Potassium) - 1s2 2s2 2p6 3s2 3p6 4s1

3.I (Iodine) -  1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p5

4.Ne (Neon) -  1s2 2s2 2p6

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water