calcium
The element in period 4 group 2A is calcium (Ca).
The symbol of the element in period 4 and group 2A is Ca, which stands for Calcium. It is a reactive alkaline earth metal with atomic number 20.
The third period element that forms a 3- ion is sulfur.
Magnesium (Mg) is a chemical element with the atomic number 12 and is located in Group 2 (or 2A) and Period 3 of the periodic table. It is a shiny, grayish-white metal that is highly reactive and commonly used in various industrial applications.
Magnesium is in period 3 of the periodic table.
The element in period 4 group 2A is calcium (Ca).
The symbol of the element in period 4 and group 2A is Ca, which stands for Calcium. It is a reactive alkaline earth metal with atomic number 20.
Since the question is 3(2a), then just write it out. 3(2a) is 2a+2a+2a or 6a.
(6ab + 9b)/(2a + 3) = 3b(2a + 3)/(2a + 3) = 3b
No element in period 3 has an atomic mass of 12.
It is a period 3 element.
2a-3+4b-2a-b-3+5=3b-1
9a +8 -2a -3 -5a = 2a +5
There is no element in period 3 group 6. The element at period 3, group 16 (called on very old periodic tables group VIA) is sulfur (S).
(6a3 - 19a2 + 15a)/(2a - 3) = a(6a2 - 19a + 15)/(2a - 3) = a(2a - 3)(3a -5)/(2a -3) = a(3a - 5)
It is the expression 3 + 2a.
The third period element that forms a 3- ion is sulfur.