Science Fill in the blank

Fill in the following blanks with suitable words:
Group 17 elements are known as ________.

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The horizontal rows in a periodic table are called _________.

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Group 18 elements are called _________.

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The tendency to gain an electron ________ on moving down in a group of the periodic table.

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In going across a period (right to left) in periodic table, the atomic size of the atom _________.

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According to Newlands’ classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the _________ element starting from oxygen.

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On going down in a group in the periodic table, the metallic character of elements _________.

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On moving from right to leftin the second period, the number of valence electrons ________.

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Group 1 elements are called ________.

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The horizontal rows in a periodic table are called ________.

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The basis for modern periodic table is _______.