Which is most likely true about electronegativity? It tends to be the same across a period.
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It tends to be the same down a group.
It tends to increase across a period.
It tends to increase down a group.

If two identical atoms are bonded,what kind of molecule is formed

Which best describes eras and periods?

Certain types of organisms such as fireflies and anglerfish can produce light through chemical reactions in a process called bioluminescence. what kind of chemical reactions occur during bioluminescence? o a) exothermic ob) endothermic oc) recomposition od) decomposition