proton - elements are arranged in order of Increasing _____ number, group - Vertical columns in periodic table is known as __________, valence - In a group, the elements have same number of ___________ electron, chemical - In a group, the elements have same __________ properties , period - horizontal row in periodic table is known as _______, shell - In a period, the elements have same number of ___________ filled with electron, duplet - helium has _______ electron arrangement , noble gas - group 18 element are known as _________, octet - group 18 elements achieve ________ electron arrangement, alkali metal - group 1 elements are known as _______, halogen - group 17 elements are known as ________, monoatomic - group 18 elements exist as ________, diatomic - group 17 elements exist as _________, weather - helium is used to fill _____________ balloons , paraffin oil - group 1 elements must be kept in ___________, organic - group 17 soluble in ________ solvent , electronegativity - ___________ is the tendency to ________ electron, amphoteric - aluminium oxide is _____________, semi metal - silicon is ______________, catalyst - transition metal can act as a ____________,

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