Answer: it's alpha decay (α)
Explanation: mass number of mother nucleus decreases by four and number of protons decreases by two. Smaller nucleus is He-4 nucleus.
Answer:
A.
Explanation:
The paper clip allows elictricity to pass, unlike the eraser or paper
Answer:
the atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope
Explanation:
Average atomic mass = f1M1 + f2M2 + … + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope. The average atomic mass of an element can be found on the periodic table, typically under the elemental symbol.
Answer:
Half-life at 629K = 252.4min
Explanation:
Using Arrhenius equation:
And as Half-life in a first order reaction is:
We can convert the half-life of 58.0min to know K₁ adn replacing in Arrhenius equation find half-life at 629K:
K = 0.01195min⁻¹ = K₁
K₂ = 2.75x10⁻³ min⁻¹
And, replacing again in Half-life expression:
<h3>Half-life at 629K = 252.4min</h3>
