Question

1 period 2nd period 01010 Nitrogen Oxyger 3rd period Sodium Magnesium Aluminum Silicon Phosphorus Sulfur Chlorine Argon Electrons in the outermost shell are responsible for the atom's chemical properties. These electrons are called valence electrons. Key Questions 5. How many electrons can fit in the second shell (n=2)? 6. Argon has all its energy levels full, like helium and neon. Therefore, how many electrons can fit in the third shell (n=3)? 7. Fill in the blanks in the following table with the number of valence electrons. Group 13 14 15 16 17 18 Hydrogen Helium period Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon 20d period Sodium Magnesium Aluminum Silicon Phosphorus Sulfur Chlorine | Argon 3. period

8. Why does carbon contain only 4 valence electrons when it has 6 total electrons?

9.True or False. Oxygen and sulfur have the same number of valence electrons.

10. True or False. Beryllium and magnesium have the same number of valence electrons.

11. True or False. Sodium and magnesium have the same number of valence electrons.

12. What is the relationship between the number of valence electrons and the column on the periodic table?

13. How is the number of shells an atom of a given element contains related to the row of the periodic table in which the element is found?

Answer 1

in n=2 shell :- solution -s. No. of e that can fit Total No. of e-=an2/ ne shell no. here n=2 Li 2 (2)? - 8 ie 2s 2p 1 2 1 11 2 + 6 - 8 solution - 6. In Ar tatal no. of é in 3rd shell = 2n? 2(3)2 = 18 1 1 1 1 1 1 1 (cs Scaningsih 3p 1 1 1 1 1 1 1 3d CamSca

solution -7. Hydrogen Helium Lithium Beryllaume U Neon Boron 3 Alumi Carbon Nitrogen 4 5 sili Phosphe oxygen fluorine 6 sulfur / chlorine sodium Magnesi -une Argon -nium San con l 1 3 4 5 6 7 solution -8 Valency of cis 4 but it has total be: C(Z=6) = 15² 25² 26 As 25² is more closure to nucleus and these 2 é are tightly attracted with nucleus. i only 20 é participates in bonding. solution - 9 True, Orggen & Sulfur have the same no. of valence é. Solution to True, Beryllium & Magnesium have the same no. of valence é. solution 11 False. Sodium & Magnesium have different valence In sodium, I valence é is there. c ragnesium, 2 valence é are there. e.

solution - 12 Number of valence é- in a column on the periodic table remains same throughout the columns solution 13 Number of ef shells along a row in the periodic table remains same but namber of e keep adding in the same shell. cs Scanned with CamScanner