Answer:

Explanation:
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In this case, since the radioactive reaction for the alpha emission of astatine-218 to bismith-214 involve the release of a helium atom as shown below:

Whereas the atomic number decreases by 2 and the mass number by 4 in agreement to the release of the Helium atom.
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Answer: d)
and
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A neutralization reaction is a double displacement reaction in which an acid reacts with base to produce salt and water. The
ions from water reacts with
ions from base to give water.

Thus products that will be released when the antacid is mixed with the hydrochloric acid in the stomach are
and
Because of the sun reflects onto the moon and makes it brighter.
Answer:
Please refer to the attachment below for answer and explanation.
Explanation:
Please refer to the attachment below for answer and explanation.