3. State Modern Periodic Law. Name the two elements of first period.
Answers
Answered by
2
Explanation:
According to modern periodic law : The properties of elements are a periodic function of their atomic numbers. The two elements of first period are Hydrogen (H) and Helium (He).
follow me
mark as brainliest
Answered by
1
hydrogen and helium
There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure. This is because in quantum physics, this period fills up the 1s orbital.
Similar questions