We know that a neutral atom of bromine is larger than a neutral atom of magnesium because: a. group number tells us how many electron orbitals surround a nucleus; bromine is in group 7a while magnesium is in group 2a. b. period number tells us how many electron orbitals surround a nucleus; bromine is in period 4 while magnesium is in period 3. c. bromine and magnesium have very different physical and chemical properties.

b. Period number tells us how many electron orbitals surround a nucleus; bromine is in period 4 while magnesium is in period 3.

Explanation:

As you go down the Periodic Table from one Period to the next, you are going to the next electron shell that is further out.

The valence electrons of bromine are in a larger shell than those in magnesium.

a. Wrong. Atomic size decreases as you go from left to right in a Period.

c. Wrong. The fact that two elements have different physical and chemical properties tells you nothing about their relative sizes.

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.

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inspire others.

commitment and passion.

good communicator.

decision-making capabilities.

accountability.

delegation and empowerment.

creativity and innovation.

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