So you know what they are and were to find them
Answer:
Option-A (XY)
Explanation:
In this problem one should focus on the number of valence electrons present in each atom. Remember that in lewis structure the dots on an atom always show the valence shell electrons. In given statement;
The,
X has one valence electron. It means that it can loose this single electron to attain the noble gas configuration i.e.
X° → X⁺ + 1e⁻
Similarly,
Y have seven valence shell electrons. Therefore, in order to complete the octet this atom will gain one electron i.e.
::Y:° + 1 e⁻ → Y⁻
Hence, we can conclude that X got stabilized by losing one electron and Y got stabilized by gaining one electron therefore, only one of each is required to form an ionic compound i.e.
<h3>
X⁺ + Y⁻ → XY</h3>
Answer: D. sugar dissolves when placed in water.
Why:
Chemical properties/changes produce NEW substances.
So when sugar dissolves in water, it breaks down, but NOT to a chemical level that separates its elements. Therefore, it would still be sugar and will not create a new compound/element.
This results in the conclusion that when sugar dissolves in water, it is a physical property, NOT chemical.
The Element Sodium -- Sodium Atom. Sodium is a chemical element in the periodic table that has the symbol Na (Natrium in Latin) and atom number 11. Sodium is a soft, waxy, silvery reactive metal belonging to the alkali metal that is abundant in natural compounds (especially halite).
