Element X forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
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Answer: Hello.
Explanation:-u + v = 80 cm -------(1)
m = -3 (The image is real, since it form on a screen)
m = v/u =- 3
v = -3u
-u – 3u = 80
-4u = 80
U = - 20 cm
Distance of lens from filament is 20 cm
V = - 3u = 60 cm
Lens formula: 1/v – 1/u = 1/f
1/60 – 1/-20 = 1/f
1/f = (1 + 3)/60 = 4/60
f = 15 cm
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here X is Magnesium Mg because it have valency 2 and in the same group of the periodic
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