Periodic law states that when the elements are arranged according to their atomic numbers, this allows elements with similar properties to appear at regular intervals. Predict the group of elements and their number of valence electrons that will combine in a 3:2 ratio to with calcium.

A) boron, aluminum, gallium; 3
B) sulfur, selenium, polonium; 6
C) oxygen, tellurium, bismuth; 2
D) nitrogen, phosphorus, arsenic; 5

My answer was D.

I am inclined to agree.

eg Ca 2 , 8 , 8, 2 . loses those outer 2 to become Ca + +
P 2, 8 , 5 gains 3 to make outer shell whole 8 so P- - -

Ca+2 *3 = 6 , P-3 * 2 = -6 etc

To predict the group of elements and their number of valence electrons that will combine with calcium in a 3:2 ratio, we need to look at the periodic table.

Calcium is in Group 2, which means it has 2 valence electrons. To find elements with a 3:2 ratio, we need to look for elements in Group 13 because they have 3 valence electrons.

The options given are:

A) boron, aluminum, gallium; 3
B) sulfur, selenium, polonium; 6
C) oxygen, tellurium, bismuth; 2
D) nitrogen, phosphorus, arsenic; 5

Based on the given options, the correct answer would be option A, which includes boron, aluminum, and gallium, all of which are in Group 13 (also known as Group IIIA). These elements have a valence electron configuration of 3.

To predict the group of elements and their number of valence electrons that will combine with calcium, we need to refer to the periodic table and the periodic law.

The periodic table is arranged in such a way that elements with similar properties are grouped together. Elements in the same group have the same number of valence electrons, which are the electrons that occupy the outermost energy level of an atom and are involved in chemical reactions.

Calcium is in Group 2 of the periodic table, also known as the alkaline earth metals. Elements in Group 2 have 2 valence electrons.

To find the group of elements that can combine with calcium in a 3:2 ratio, we need to look for elements that have a ratio of 3:2 when combined with calcium.

Let's look at the options:

A) boron, aluminum, gallium; 3
B) sulfur, selenium, polonium; 6
C) oxygen, tellurium, bismuth; 2
D) nitrogen, phosphorus, arsenic; 5

Out of these options, option A) boron, aluminum, gallium; 3, seems to be the correct answer. Boron, aluminum, and gallium are located in Group 13, and they each have 3 valence electrons. When combined with calcium, they would form compounds with a 3:2 ratio.

So, the correct answer is A) boron, aluminum, gallium; 3.