The table compares some characteristics of two atoms. Charged Particles
Atom Number of Neutrons Mass Number
X 10 19
Y 8 16

Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.

1. Atoms X and Atom Y are in the same family.
2. Atom X is in a column to the right of Atom Y on the periodic table.
3. Atom X and Atom Y are in the same row on the periodic table.
4. Atoms X and Atom Y are isotopes.

distance, luminosity, brightness, radius, chemical composition, and temperature

personal, she chose to do it.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.