Question

i want the answer of
5 and 6​

Answer 1

Answer:

MaiN points of chapter"breathiñg & exchange of gases.....?.

Answer 2

• Answer:
• Group 1 Group 2
• a) One electron in the valence shell Two electrons in the valence shell
• b) Larger atomic size compared to Group 2 Smaller atomic size compared to Group 1
• c) More metallic in nature Comparatively less metallic
• d) Highly electropositive, readily loses electron Comparatively less electropositive
• e) Oxide formula: X
• 2
• O Oxide formula: XO
• f) Chloride formula: XCl Chloride formula: XCl
• 2
• Answer :
• b
• Solution :
• 24Cr+5⇒(1s2)(2s22p6)(3s23p6)(3d1)
• σ=1×(18)=18