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The positions of three elements A, B and C in the periodic table are indicated below:Group 16Group 17--(First Period)-A(Second period)--(Third Period)BC(Fourth Period)(a) State whether element C would be a metal or a non-metal. Why? (b) Which is the more active element, A or C? Why? (c) Which type of ion (cation or anion) will be formed by the element C? Why? |
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Answer» (a) Element C is non-metal because it belongs to 17 group and it contains 7 valence electrons so it can gain only one electron. So it is non-metal. (b) In non-metals, electronegativity increases from left to right in a period due to increase in effective nuclear charge and decreases from top to bottom in a group due to increment in size. So A is the most active element. (c) Since C is non-metal and it has 7 valence electrons. So it can gain only one electron and anion will be formed. |
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