Explain how chemists can state with
certainty that no one will discover an element
that would appear on the periodic table
between sulfur (S) and chlorine (Cl)

The nucleus of a sulfur atom contains 16 protons.

The nucleus of a chlorine atom contains 17 protons.

Explanation:

Atoms are arranged in the Periodic Table according to the number of protons in their nuclei — their atomic numbers.

A proton is an integral particle —  you can't have half a proton.

S and Cl are adjacent in the Periodic Table, so it is impossible to find an element that will fit between them.

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

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- decrease the number of plants and animals living in the water.