Q 2 Justify the following statements. a) Every crystallographic axis is an axis of rotation.
b) Crystal is a closed body
c) {1010} is a Miller Bravis index notation.
d) A44A3 is a possible symmetry.
e) Hexahedron is an open form.

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b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.