GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the further an electron is from the positive nucleus, the easier it can be lost in reaction
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the attraction between the nucleus and the last electron gets stronger
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these react by losing electrons and reactivity increases as you go up the group.
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None of the above
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Detailed explanation-1: -The reactivity of Group 1 elements increases as you go down the group because: the atoms get larger. the outer electron gets further from the nucleus. the attraction between the nucleus and outer electron gets weaker – so the electron is more easily lost.
Detailed explanation-2: -The reactivity of the alkali metals, Column 1 on the periodic table, increases as you move down the family. Since the effective nuclear charge within a family is essentially the same, the reactivity increases because of increasing size of the atoms. A size increase occurs because of one additional energy level per row.
Detailed explanation-3: -Electropositivity increases down the group of alkali metals, thus the reactivity increases down the group of alkali metals. The reactivity of halogens is due to their electronegativity. Electronegativity decreases down the group, thus reactivity of halogens decreases down the group.
Detailed explanation-4: -Reactivity increases down the group. This is because the outer electron in each atom is further away from the nucleus as you go down the group and so the electrostatic forces between the nucleus and the outer electron are weaker. This means electrons are more easily given up in a reaction.
Detailed explanation-5: -In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.