How many types of sulphides are formed when alkali metals react with sulphur?
2
3
4
5
4 The attractive force which binds a hydrogen atom of one molecule with an electronegative atom of another molecule of the same compound is called __________.
nuclear bond
electromagnetic force
hydrogen bond
covalent bond
5 Ionization energy _____________ down the group within the alkali metals.
increases
has no fixed pattern
remains const
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