Question

1. which of the four elements is most likely to form cations in its reactions?

a. nh
b. ts
c. mc
d. og

1. the fact that the four new elements are period 7 of the table means that they all:

a. have seven shells of electrons
b. have seven valence electrons
c. form ions with charges of 7+
d. have an effective nuclear charge of 7+

1. the search is now on for element with atomic number 119. based on periodic trends, which of the following would most likely be true of this element?

a. it would be a nonmetal.
b. it would be placed in period 7.
c. it would have a full valence shell of electrons.
d. it would most likely form cations when it reacts.

Explanation:

• Question 18: Metals are more likely to form cations. Among the given elements, Nh (Nihonium) and Mc (Moscovium) are metals. But based on periodic trends and electron - loss tendencies, Mc is more metallic in nature compared to Nh in this context.
• Question 19: Elements in Period 7 of the periodic table have seven electron shells. Option B is incorrect as valence electrons depend on the group. Option C is wrong as they don't form \(7+\) ions. Option D is incorrect as effective nuclear charge is not simply \(7+\).
• Question 20: Element 119 (assuming it follows periodic trends) would be a metal (so A is wrong), not in Period 7 (already filled up to 118 in Period 7, so B is wrong), and won't have a full valence shell (so C is wrong). Metals tend to form cations, so D is correct.

Answer:

1. C. Mc
2. A. have seven shells of electrons
3. D. It would most likely form cations when it reacts.