![]() ![]() This clearly lists Aresenic as a metalloid which is a part of option C.Ĩ 8. Elements next to the left or right of this line are metalloids. ![]() In the Periodic Table, the location of the stepped line divides metals and nonmetals. Which set of elements contains a metalloid?Ī) Li, Mg, Ca, Kr B) Ba, Ag, Sn, Xe C) K, Mn, As, Ar D) Fr, F, O, Rn Correct Answer: Option C - K, Mn, As, Ar The metalloids are elements which have intermediate properties and cannot be classified as either metals or nonmetals. The more they increase, the more they pull and attract the outer electrons from the outermost electron shell, making the atomic radius smaller.ħ 7. Going from left to right across the periodic table, the number of protons increases. Atomic Radius gets greater down the periodic table and gets smaller to the right in the periodic table. Which of the following elements has the smallest atomic radius?Ī) Nickel B) Cobalt C) Potassium D) Calcium Correct Answer: Option A - Nickel Atomic radius is called the width of an atom, but it is not a precisely defined physical quantity, nor is it constant in all circumstances. By definition, the first ionization energy of an element is the energy needed to remove the outermost or highest energy, electron from a neutral atom in the gas phaseĦ 6. Which element has the highest first ionization energy? A) Sodiumī) Phosphorus C) Aluminum D) Calcium Correct Answer: Option B: Phosphorus The energy needed to remove one or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the chemical behavior of the atom. The only transition compound in the above choices is CrCl3. Which compound forms a colored aqueous solution?Ī) CaCl22 B) CrCl3 C) NaOH D) KBr Correct Answer: Option B - CrCl3 Colored aqueous solutions are a characteristic of transition compounds. Order of group 15 elements in descending rate of metallic character is: Bi(Bismuth), Sb(Antimony), As(Arsenic), P(Phosphorus) and N(Nitrogen).Ĥ 4. Bi is the last element in group 15 so it is the most metallic. But it increases going down a group (last element in a group will have the most metallic character). Which element in Group 15 has the strongest metallic character?Ī) As B) P C) N D) Bi Correct Answer: Option D - Bi From left to right across the period, metallic character decreases. How many valence electrons does an atom of this element in the ground state have? A) 1 B) 2 C) 3 D) 4 Correct Answer: Option B - 2 The element having the first ionization energy of, 736 kJ/mol is Magnesium.ģ 3. The first ionization energy of an element is 736 kJ per mole of atoms.
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