Answer:
<em>1.) Make a He atom with a mass of 4. How many protons did you put in the nucleus?</em>
<u>2</u>
<em>2.) Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?</em>
<u>1</u>
<em>3.) Make a N atom with a mass number of 14. How many neutrons are in the nucleus?</em>
<u>7</u>
<em>4.) Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?</em>
<u>3</u>
Explanation:
<em>Did it on Edgenuity and got it correct (2020).</em>
Explanation:
Initial mass of the isotope 90-Sr in baby= 1.00 μg
Formula used :
where,
= initial mass of isotope
N = mass of the parent isotope left after the time, (t)
= half life of the isotope = 28.1 years
= rate constant
a) Time taken by the sample, t = 18 years
0.6415 μg will remain after 18 years.
b) Time taken by the sample, t = 70 years
0.1779 μg will remain after 70 years.
The acceleration on an object is proportional to the resultant force and inversely proportional to the mass of the object
<h3>Further explanation </h3>Newton's 2nd law explains that the acceleration produced by <em>the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object </em>
∑F = m. a
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Newton's equation shows that the greater the net force applied to an object, the greater the acceleration, conversely the greater the mass of the object, the smaller the object's acceleration.
You can use this principle to choose the available answer options, because the questions are not complete