Which of the following is a physical model of the sun? a. an equation that describes the sun’s motion b. a chart that lists the temperatures of different parts of the sun c. a computer program that shows how the sun changes over time d. a paragraph that describes the sun’s structure e. a small yellow ball that represents the sun

E. a small yellow ball that represents the Sun

Explanation:

The question asks for a physical model/representation of the Sun.

The answer has to be something physical, something concrete, something you can touch.  This means it has to be in 3-dimensions, not just an image.

The other answer choices are providing information or abstract representations.  Abstract models are ones you cannot physically touch, but can picture in your mind or view as an image.

- 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