Question

the number of protons in an atom determines the kind of atom, or element, it is. an element is a substance in which all of the atoms are identical (the periodic table shows all the known elements). every atom of hydrogen, for example, has one proton and one electron, with no neutrons. every atom of carbon has six protons, six electrons, and six neutrons. the number of protons determines which element it is. electrons usually remain a constant distance from the nucleus in precise shells. the shell closest to the nucleus can hold two electrons. the next shell can hold up to eight. the outer shells cans hold even more. some atoms with many protons can have as many as seven shells with electrons in them. the electrons in the shells closest to the nucleus have a strong force of attraction to the protons. sometimes, the electrons in the outermost shells do not. these electrons can be pushed out of their orbits. applying a force can make them move from one atom to another. these moving electrons are electricity. fill in the blank. 1. electricity is moving __________. 2. ________ is the flow of electrical power or charge. 3. a ________ energy source is a source that we get from the conversion of other sources of energy. 4. name four primary energy sources. ________ ________ ________ ________ 5. everything in the universe is made of ________. 6. ________ have a positive charge (+) and ________ have a negative charge (-). 7. the number of __________ in an atom determines the kind of element it is.

Explanation:

Question 1

From the text: "These moving electrons are electricity." So we fill in "electrons".

The text implies and general knowledge: Electricity is the flow of electrical power or charge.

A secondary energy source is derived from conversion of primary sources (e.g., electricity from coal, solar etc. conversion). The text context about energy source conversion points to "secondary".

Answer:

electrons

Question 2