Briefly describe the trend in how elements form ions, as you look across the periodic table from Group 1 to Group 17

For cations:

• The trend of cation formation increases.

For anions:

• The trend of anion formation decreases

Explanation:

Across the periodic table from group I to group VII, Atomic radius increases due to increase in energy levels. While nuclear charge is almost constant due to constant number of protons since electrons are added on the same shell.

Therefore, the effective nuclear charge will decrease since net nuclear attraction also decreases.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

b.

the accuracy of the data.