QUESTION 16 As you move toward the top right corner of the periodic table atomic radius
O and first ionization energy both increase.
O and first ionization energy both decrease.
O decreases and first ionization energy increases.
O increases and first ionization energy decreases.

QUESTION 17

Use the octet rule to predict the number of bonds C, N, O. and F are likely to make in a molecule.
O four. five, six. seven, respectively
O three. three, two. two. respectively
O four, three, two. one, respectively
O four. one. one, one, respectively
O four, four, three, three, respectively

- 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

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