According to Dalton; All matter is made up of small particles called atoms.
<u>Answer:</u> The original element is
<u>Explanation:</u>
Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units.
The released alpha particle is also known as helium nucleus.
For the given alpha decay process of an isotope:
<u>To calculate A:</u>
Total mass on reactant side = total mass on product side
A = 208 + 4
A = 212
<u>To calculate Z:</u>
Total atomic number on reactant side = total atomic number on product side
Z = 82 + 2
Z = 84
The isotopic symbol of unknown element is
Hence, the original element is
Answer:
1. What is a substance that CANNOT be chemically broken down into simpler substances?
2. What type of change is one that produces new substances like burning wood to make ashes or mixing mentos and coke. You can't get the wood or the mentos back.
3. What is a change from a solid directly to a gas
4. What is a change from a gas to a liquid
5. What are nonmetals in group 7A of the periodic table?
1. An element
2. Chemical change
3. sublimation
4. condensations
5. Halogens
The answer you selected in the picture is correct!
Answer:
opposite of a proton is an electron