Write true or false for the following statements:

In the Modern periodic table, a zig-zag line separates metals from non-metals. The borderline elements-boron, silicon, germanium, arsenic, antimony, tellurium and polonium are intermediate in properties and are called metalloids or semimetals.

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Na, Mg, Li, Al, Si, F, P and Cl belong to the third period of the Modern periodic table.

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The term atomic size refers to the distance between the centre of the nucleus and the penultimate shell of an isolated atom.

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Metallic character decreases across a period and increases down a group because the effective nuclear charge acting on the valence shell electrons increase across a period and decreases down the group.

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Non-metals are electronegative. They tend to form bonds by gaining electrons. As the trends in the electronegativity show, non-metals are found on the right-hand side of the periodic table towards the top.