Which of the following pairs of elements is most likely to form an ionic compound? calcium and iodine, nitrogen and phosphorus, fluorine and sulfur, it sodium and lithium

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.

What changes occur in the reaction indicated by the equation? check all that apply. the hydrogen nucleus loses protons. the oxygen nucleus gains protons. the bond in h2 is broken, and new bonds are formed between hydrogen and oxygen atoms. each electron associated with a hydrogen atom is shared with an oxygen atom.