Answer:
this is the answer explanation of previous question. as what you say in comment i do that
The answer is O2.
The ionic charge of something can be determined by it's place in the periodic table.
Answer: C) the values of Kb and Kw
Explanation: i just took the test
The alpha particle is the helium nucleus.
The mass of helium nucleus (⁴₂He) is 4u.
The mass of radioactive atom decreases by 4u. Look at the reaction below:
²²³₈₈Ra ---> ⁴₂He + ²¹⁹₈₆Rn
Answer: Manholes are usually round, primarily because roundness is the best shape to resist the compression of the earth; covers are round because they are easier to manufacture than square or rectangular shapes, they are easier to move by rolling, and they can't fall into the opening.
Explanation:
