Answer:
D. Cr
Explanation:
In order to determine which atom has at least one electron in its d orbital, we have to write their theoretical electron configurations.
- ₁₉K 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
- ₂₄Cr 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴
Cr has 4 electrons in d orbitals. Cr belongs to the d-block in the periodic table.
It depends if your talking about science or math but It could be both if it says something about weathering which is what causes a rock to break it might be chemical ill comment and tell you the correct answer
Answer:
it causes alot of harm to the earth.
Explanation:
earthquakes
an so on
Answer:
B. Halogen
Explanation:
Halogens are the family of chemical elements found in the group VIIA of the periodic table which means they possess seven (7) outer electrons. Some examples of halogens are Fluorine (F), Iodine (I), Bromine (Br), and Chlorine (Cl).
A halogen, or an element located in group 7A, will form a salt when reacted with a metal atom.
For example, when Chlorine reacts with Sodium it would form a salt known as Sodium Chloride.
Na + Cl ----> NaCl