[@Mr.Sahib_Gaming is live!] playing Minecraft in lifeboat smp 😉

Welcome to Rai Warrior 🎮 Daily Free Fire Gameplay & Shorts. Subscribe for amazing Free Fire content. #raiwarrior​​ #freefire​​ #gaming​​ #shorts​​ #freefiremax​​ #gameplay​​ #shortsvideo​​ #ffshorts​​ #freefiregameplay​​ #freefirehighlights​​ #gamingshorts​​ #garenafreefire​​ #freefireindia​33. Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain. Answer: Helium has only one shell (K-shell), which can hold a maximum of 2 electrons. Since its outermost shell is completely filled, helium is stable and does not gain, lose, or share electrons. Therefore, its valency is zero. 34. Fill in the blanks. (a) Rutherford's α-particle scattering experiment led to the discovery of the nucleus. (b) Isotopes have same atomic number but different mass numbers. (c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be 0 and 1 respectively. (d) The electronic configuration of silicon is 2, 8, 4 and that of sulphur is 2, 8, 6. 35. An element X has a mass number 4 and atomic number 2. Write the valency of this element. Answer: Atomic number = 2, so the element is Helium. Electronic configuration = 2 Since its outermost shell is completely filled, its valency is 0. Long Answer Questions 36. Why do Helium, Neon and Argon have a zero valency? Answer: Helium, Neon and Argon are noble gases. Their outermost shells are completely filled (Helium has 2 electrons in K-shell, while Neon and Argon have 8 electrons in their outermost shells). Therefore, they are stable and do not gain, lose, or share electrons. Hence, their valency is zero. 37. The ratio of the radii of hydrogen atom and its nucleus is �. Answer: (i) Since volume is proportional to the cube of the radius, Ratio of their sizes (volumes) = � (ii) Radius of Earth � m E🎯 target 1k subcribe #contentcreator #subcribe #shorts #totalgaminghttps://www.youtube.com/channel/UCGiG... target 1k subcribe #contentcreator #subcribe #shorts #totalgaming|---|---|---| | | | | |---|---|---| | | | | |---|---|---| | | | | |---|---|---|autohead shot 😎😎 #short #garenafreefire #totalgaming #GURJOTxGAMING|---|---|---| | | | | |---|---|---| | | | | |---|---|---| | | | | |---|---|---|aryan Vs Virat #garenafreefire #shorts #mrbrokenff #totalgaming33. Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain. Answer: Helium has only one shell (K-shell), which can hold a maximum of 2 electrons. Since its outermost shell is completely filled, helium is stable and does not gain, lose, or share electrons. Therefore, its valency is zero. 34. Fill in the blanks. (a) Rutherford's α-particle scattering experiment led to the discovery of the nucleus. (b) Isotopes have same atomic number but different mass numbers. (c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be 0 and 1 respectively. (d) The electronic configuration of silicon is 2, 8, 4 and that of sulphur is 2, 8, 6. 35. An element X has a mass number 4 and atomic number 2. Write the valency of this element. Answer: Atomic number = 2, so the element is Helium. Electronic configuration = 2 Since its outermost shell is completely filled, its valency is 0. Long Answer Questions 36. Why do Helium, Neon and Argon have a zero valency? Answer: Helium, Neon and Argon are noble gases. Their outermost shells are completely filled (Helium has 2 electrons in K-shell, while Neon and Argon have 8 electrons in their outermost shells). Therefore, they are stable and do not gain, lose, or share electrons. Hence, their valency is zero. 37. The ratio of the radii of hydrogen atom and its nucleus is �. Answer: (i) Since volume is proportional to the cube of the radius, Ratio of their sizes (volumes) = � (ii) Radius of Earth � m E