The magnitude of a star is a number that is a measure of its brightness as seen on Earth. The brighter the star, the lower its magnitude. The data below show the magnitudes of five stars in our galaxy. Between what two consecutive integers is the magnitude of each star located? In most applications, the magnitude of a number is its size or amount. However, when talking about the magnitude of a star, magnitude includes negative numbers. Polaris (The North Star): 1.97 Sirius (The Dog Star): -1.45 Hadar (Beta Centauri): 0.61 Arcturus: -0.04 Canopus: -0.72

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

answerambulatory;