What property do all elements in the same column of the Periodic Table as boron have in common?

  • A
    They have the same number of valence electrons.
  • B
    They have the same atomic mass.
  • C
    They have the same number of shells.
  • D
    They have the same metallic character.

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By considering their position in the Periodic Table,which one of the following elements would you expect to have maximum metallic characteristic?
$Ga$,$Ge$,$As$,$Se$,$Be$

Did Dobereiner's triads also exist in the columns of Newlands' Octaves? Compare and find out.

Difficult
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$Lithium$,$sodium$,and $potassium$ are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

Name:
$(a)$ three elements that have a single electron in their outermost shells.
$(b)$ two elements that have two electrons in their outermost shells.
$(c)$ three elements with filled outermost shells.

Which element has
$(a)$ a total of three shells,with four electrons in its valence shell?
$(b)$ a total of two shells,with three electrons in its valence shell?
$(c)$ twice as many electrons in its second shell as in its first shell?

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