Answer:
Most radioactive materials decay and they mostly have a decay rate. The time it takes for half of a radioactive material to decay is called half life.
The 7 minute significance of half-life simply points to the total time it takes after which half of the radioactive material would have completely decayed,
Answer:
physical
Explanation:
it is physical because you add another chemical to the sodium
Answer:
law of multiple proportions
Explanation:
The law of multiple proportions states that, if two elements A and B, combine to form more than one chemical compound. Then the various masses of one element A, which combine separately with a fixed mass of element B are in simple multiple ratio.
We can see that the ratio of oxygen that combines with carbon in the two compounds( A and B) is 1:2. This demonstrates the law of multiple proportions.
The substances A and B must be CO and CO2 respectively.
Answer: option B and option C
Explanation:
<h2>It means that there are Z positive nuclear charges, and this determines the identity of the element. If the element is neutral, this means that there are precisely Z electrons, and the overall electronic charge is −Z . And thus the net ELECTRIC charge of the ATOM is Z+(−Z)=0 , i.e. zero </h2>
