Answer:
Any thing that occupied volume and mass in air is known as matter
It might change because of the amout of rain that fell in the year and the melting of ice which allows the water amount to increase
Answer:
C. Arsenic
Explanation:
Each period is terminated by a noble gas with a closed valence shell with electronic configuration ns²np⁶. Since noble gases have completely filled orbitals in the valence shell and are very stable, it becomes very difficult to alter their stable arrangement by the addition or removal of electrons. They they exhibit very low chemical reactivity
Noble gas elements are: Neon, Argon, Krypton, Xenon, Radon, Helium (2 electrons in outer shell, stable).
Non radioactive carbon 13 has 7 protons per atom.
They are combined 50% from your mom and the other from your dad