Place the following elements in order of decreasing atomic size: antimony, selenium, fluorine, rubidium, strontium, and arsenic.

ANTIMONY

STRONTIUM

RUBIDIUM

ARSENIC

SELENIUM

FLOURINE

Explanation:

ATOMIC SIZE INCREASES FROM TOP TO BOTTOM and DECREASES FROM LEFT TO RIGHT.

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if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

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