I am not 100% sure. But I believe it is B!
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Answer:
Connection between the sodium and chlorine atoms are Ionic
Explanation:
Ionic bond is defined as the bond formed between two atoms by the complete transferring of electrons. It is type of chemical bond that generates two oppositely charged ions i.e Anion (-ve charge) and cation (+ve charge).
Metals that has 1, 2 or 3 electrons in its valence shell losses valence electrons and become positively charged cation. These electron attracted by the non-metals to form bond and become negatively charged anion. In this way, ionic bond is generated between 2 atoms.
Sodium is a metal with 1 electron in its valence shell. Chlorine is a non-metal with 7 less electrons (need 1 more to complete its valence shell to stabilize) in its valence shell. When sodium comes in contact with chlorine, it losses its one valence electron and become cation with +1 charge. This electron is accepted by chlorine and become anion with -1 charge. In this way ionic bond is formed between sodium and chloride.
Na⁺ + Cl ⁻⇒ NaCl
The correct answer is - continental tropical air mass.
If an air mass forms over a land mass, than that air mass is of continental type. Depending on the location of the area where the air masses are forming, they can be cold or warm. In this case, we have an area that is warm, part of which is near the tropics, part bordering with them, thus we will have the formation of a continental tropical air mass.
This type of air masses is characterized by being hot and dry. That results in hot weather, usually with a period of drought, thus very dry. This type of air masses often cause lot of damage to the crops, but also can affect the human health, especially the elderly people.
This would be called elevation