Answer:
- <em>The inertness of the noble gases is due to </em><u>the fact that their outermost main energy level of electrons (valence shell) is full.</u>
Explanation:
<em>Inertiness of the noble gases</em> refers to their lack of reactivity, i.e. the stability provided by a full valence electron shell.
The noble gases are He, Ne, Ar, Kr, Xe, Rd, and, the most recently discovered, Og.
They are located in the last column (18) of the periodic table.
Then, when you do the electron configuration of the noble gases, you find they have the outermost prinicpal energy level full. These are their electron configurations using the abbreviated form:
Being their valence orbitals full, these elements will not be very likely to exchange or share electrons, which is the reason of their inertness.
This does not mean that they do not react at all. Xe and F (the most reactive nonmetal) form some compounds.
1. The half-life of the element is 22 years
2. The time taken for 308 g of the sample to decay to 4.8125 g is 132 years
<h3>Definition of half-life </h3>
Half-life is simply defined as the time taken for half of a material to decay.
<h3>1. How to determine the half-life </h3>
- Original amount (N₀) = 45 g
- Half of the original amount = 45 / 2 = 22.5 g
From the diagram, the time for 22.5 g is 22 years.
Thus, the half-life of the element is 22 years
<h3>2. How to determine the time </h3><h3>i. Determination of the number of half-lives </h3>
- Original amount (N₀) = 308 g
- Amount remaining (N) = 4.8125 g
- Number of half-lives (n) =?
2ⁿ = N₀ / N
2ⁿ = 308 / 4.8125
2ⁿ = 64
2ⁿ = 2⁶
n = 6
<h3>ii. Determination of the time </h3>
- Number of half-lives (n) = 6
- Half-life (t½) = 22 years
t = n × t½
t = 6 × 22
t = 132 years
See attached photo for diagram
Learn more about half life:
brainly.com/question/26374513
Single replacement
Hope that helps!
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.
Explanation:
A neutral atom contains the same number of electrons as protons and that means that the electric charge of the atom is neutral or otherwise known as zero. However, if a particular atom loses an electron, the atom becomes positively charged because there is more protons than electrons.
THIS IS CALLED A CATION.
hope this helps x
