39. The 2 rows of elements placed below the main part of tge periodic table are:
☞ B. The lathanaide series at the bottom row and the actinide series, at the top row
-The two rows of elements present at the bottom of the periodic table are called the 4f series or lanthanoids and 5f or actanoids. They are also called inner transition elements.
40. Which of the ff. elements is likely to be the most received with acid?
☞ D. AI (Group 13, Period 3)
- Aluminum mainly occurs as Al3+ (aq) under acidic conditions, and as Al(OH)4- (aq) under neutral to alkalic conditions.
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⭐️ANSWER⭐️
39. The 2 rows of elements placed below the main part of tge periodic table are:
☞ B. The lathanaide series at the bottom row and the actinide series, at the top row
-The two rows of elements present at the bottom of the periodic table are called the 4f series or lanthanoids and 5f or actanoids. They are also called inner transition elements.
40. Which of the ff. elements is likely to be the most received with acid?
☞ D. AI (Group 13, Period 3)
- Aluminum mainly occurs as Al3+ (aq) under acidic conditions, and as Al(OH)4- (aq) under neutral to alkalic conditions.
HOPE IT HELPS ^ω^