7A (17), the (18) right of the periodic (19) table, is made up of (20) __halogens_____ gases. The (21) outer valence level is (22) _______and the gases (23) are _______. (25) halogens, like group 8A (line 26) (18) are also (27) __________, but these (28) elements have _______ (29) electrons in their (30) valence level. They do (31) react with other (32) elements.
7A (17), the (18) right of the periodic (19) table, is made up of (20) halogens gases. The (21) outer valence level is (22) fully filled and the gases (23) are highly reactive. (25) Halogens, like group 8A (line 26) (18) are also nonmetals, but these (28) elements have seven (29) electrons in their (30) valence level. They do (31) react with other (32) elements.
20. The missing word is "halogens".
21. The missing word is "outer".
22. The missing word is "full".
23. The missing word is "gases".
27. The missing word is "non-metals".
28. The missing word is "elements".
29. The missing number is "seven".
30. The missing word is "valence".
31. The missing word is "react".
32. The missing word is "elements".
To answer this question, we need to identify the halogens in the periodic table and provide information about their outer valence level, properties, and reactivity.
First, let's start with the question numbers:
19: The 7th element in the periodic table is Nitrogen (N), which is not a halogen. Therefore, there seems to be an error with the question numbering. Let's proceed by assuming that the missing question number should be 24.
20: The blank should be filled with the word "halogens."
21: The outermost energy level of the halogens is the second energy level (also known as the second shell).
22: The blank should be filled with the number 7. Halogens have 7 valence electrons.
23: The blank should be filled with the word "gases." Halogens exist as gases at room temperature, with the exception of bromine (Br), which is a liquid.
24: Now that we have filled in the missing number, we can move on to the next part.
25: The word "halogens" is already filled in the sentence.
26: Group 8A is missing in the question. However, it seems that it should be filled with the term "noble gases." Group 8A (or 18) of the periodic table consists of the noble gases, which are chemically inert.
27: The blank should be filled with the word "nonmetals." Both the halogens and the noble gases are nonmetals.
28: The blank should be filled with the word "eight." Halogens have eight valence electrons in their outer energy level.
29: The blank should be filled with the word "reactive." The halogens are highly reactive due to their tendency to gain an electron to achieve a stable electron configuration.
30: The blank should be filled with the term "valence level" or "valence shell." This refers to the outermost energy level of an atom.
31: The blank should be filled with the word "do." Halogens do react with other elements due to their reactivity.
32: The blank should be filled with the word "elements." Halogens can react with metals, nonmetals, and even other halogens to form compounds.
So, the completed answer to the original question would be:
"Group 7A (or 17), the right of the periodic table, is made up of halogens gases. The outer valence level is the second shell, and the gases are nonmetals. Halogens, like group 8A (or 18) noble gases, are also nonmetals but these elements have eight electrons in their valence level. They do react with other elements."