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>
the second option is best described
Explanation:
.
Answer: all of the above
Explanation:
Mass and density are important factors to describe the property and the burning is an ability.
Answer:
The disease is named after a British physician, James Parkinson, who first described it in “An Essay on the Shaking Palsy” in 1817. In Parkinson's disease, nerve cells, also called neurons, in a region of the brain called the substantia nigra begin to malfunction or die, a process called neurodegeneration.
An atom is the smallest thing ever known to exist. It can only be seen by the eye of a type of telescope.