SCIENCE
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
How many elements are in HHe
|
|
3
|
|
|
4
|
|
|
2
|
|
|
5
|
Explanation:
Detailed explanation-1: -Hence, there are 8 elements in period 2 of the periodic table.
Detailed explanation-2: -Lithium, atomic number 3 begins the second period, which has 8 elements.
Detailed explanation-3: -The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells.
Detailed explanation-4: -Helium is the element that is atomic number 2 on the periodic table.
Detailed explanation-5: -Second and third period of the modern periodic table contains 8 elements.
There is 1 question to complete.