I’m struggling... please help (idk what category to put this in lol)

A. Electrons are not present in the nucleus of a silicon atom

B. There are 14 protons in the nucleus of a silicon atom.

E. There are equal members of protons and neutrons in a silicon atom with a mass number of 28.

Explanation:

The nuclei of atoms consist of the protons and neutrons of an atom, so you would not find any electrons in them. They are found outside the nucleus.

The nucleus of a silicon atom has 14 protons, this also represents the atomic number of the element. If you want to base this off on the diagramn, you can look at the legend of protons. It is the triangles. All you need to do is count how many triangles there are inside the circle (the circle represents the nucleus)

Incidently, the number of protons is equal to the number of neutrons here. If you add them up together that would be 28. The mass number of an atom is equal to the sum of protons and neutrons. So 14 + 14 = 28.

But don't think that all atoms of elements work out this way.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.