It's the first option choice on Plato

Which of the following is a period 4 representative element?
O A. C
O B. An
O C. Ti
O D. K



- Carbon (from Latin: carbo "coal") is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalen - making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.
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D. Cell membrane: surrounds a cell and allows substances to pass in and out
Answer:
Chocolate melts and becomes really sticky once heated.
Add-on:
hope that helped at all.
Answer:
0.31 mol K x 39.1 grams K/ 1 mol k = 12.1 g
Explanation:
molar mass of K: 39.1
In order to find the mass in 0.31 mol of K, you must covert moles to grams. In one mole of Potassium there is 39.1 grams.