Use the description below to answer the following question: which of the following statements best describes how Atom X and Atom Y are related? Atom X has 9 protons, 10 neutrons, and 9 electrons Atom Y has 9 protons, 9 neutrons, and 9 electron a. X and Y are isotopes of the same element
b. X is an ion, and Y is a neutral atom
c. X and Y are different elements
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d. X is the element neon, and Y is the element fluorine

The number of neutrons is obtain through the difference of the mass number and the number of electrons

Explanation:

By looking at the periodic table, you will see that Fluorine has 9 protons.

Since the number of electrons equal the number of protons, Fluorine has 9 electrons as well.

Meanwhile, it's mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine.

As for the atomic number, it is obtainable through the periodic table itself.

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.