Please help.

Carbon-14 has a half-life of 5,730 years. A plant fossil was found to contain 1.75 grams of carbon-14. How long ago did the bone contain 7 grams of carbon-14?

THE BONE WAS 11, 460 YEARS WHEN IT CONTAIN 7 g OF CARBON-14

Explanation:

To calculate the age of a substance using isotopic dating, we use the equation below;

how old (time) = number of lives (n) * half life (t1/2)

n =the number of lives from 7g to 1.75 g

n = 7 > 3.5 > 1.75 = 2 lives

t1/2 = 5730 years.

How old was the fossil when it contains 7 g of carbon- 14 will be;

how old = n * t1/2

= 2 * 5730 years

= 11, 460 years.

The bone contains 7 grams of carbon-14 at 11, 460 years.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.