What does the “188” represent in Tantalum-188 A. mass number
B. atomic number
C. mass defect

mass number

Explanation:

When there is an element name followed by a dash and then a number, the number simply represents the mass number.

for example:

Oxygen- 18

18 represents the mass number of this particular isotope

u i forgot the answer?

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.