A teacher is giving a demonstration at the front of the classroom. The students are being asked to identify which group an element would belong to based on its properties. A bowl of water sits on the lab bench, along with a butter knife and the unidentified element. The teacher buts the element into very small pieces using a butter knife. She shows the class that the element is sold and has a dull finish. She drops the small piece of the element into the bowl of water where it briefly sizzles, and a flash of light appears. -Based on the demonstration, what family (group) do you think this element belongs in? Justify your answer using evidence from the text.

- 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

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.