Answer:
The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.
The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
i thank its B my big brother helped me we thank its b
Answer:
Rachel needs 0.52 kg of fertilizer.
Explanation:
Since the surface is a <em>square</em> of 10 ft of size its area is A = 10 ft x 10 ft = 1.0 x 10² ft². <em>One third</em> of that space is devoted to tomatoes (<em>"space is divided equally among tomatoes, lettuce, and strawberries"</em>), that is, 1/3 x 100 ft² = 33 ft².
We calculate the kilograms of fertilizer required we need to know 2 equivalences:
1 ac = 43,560 ft²
1 lb = 0.4535 kg
Then, we can use proportions to find out the amount of fertilizer used:
β⁻ emission is an emission of an electron by converting a neutron
to a proton. Hence, in β⁻<span> decay, the atomic
number of daughter atom increases by 1 than the parent atom and
mass number is not changed in the formed daughter nucleus.</span>
Hence, formed daughter atom should have 89 + 1 = 90 as atomic number. Hence, the daughter atom should be Th (<span>Thorium)</span>
<span>The equation is</span>
₈₉²²⁸Ac → ₉₀²²⁸Th + ₋₁⁰β + energy<span>
</span>
Answer:
Are there any options or starting points for this question?
Explanation: