<u>Answer:</u>
<em>A) Lose, Gain</em>
<u>Explanation:</u>
<em>Octet is a game plan of an iota where the peripheral shell is filled by 8 electrons.</em> So as to achieve octet , the components either lose or gain electrons relying on their reactivity , number of valence electrons and different variables.
<em>For a metal :</em> A non - metal increases electrons to finish octet. <em>Eight electrons fill the valence level for every single respectable gas, with the exception of helium, which has two electrons in its full valence level.</em>
Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years

Where, k is rate constant
So,


The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,





So,
<u>The rock is 3.75 billion years ago.</u>
They are Estonia, Latvia, and Lithuania
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Learn more about identity management here:brainly.com/question/16216994