Why are there only two elements in the first period of the periodic table? (1 point) because each row increases in atomic mass by a specific number, so anything over five is in the second row
O because the next elements have other things in common and they need to be arranged together
because the first two elements both start with H and are grouped together
o because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits

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b. examine and describe cells

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.