The three main groups of elements are metals, nonmetals, and Noble gases.
(A)
(B)
(C)
(D)
Isotopes.
Alkali metals.
Metalloids

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

What are the similarities of physical and chemical change ?

Pls ill give u brainliest which of the following is true about science? 1. political conditions are unable to influence it. 2. economic concerns may prevent it from solving problems.