Answer:
A
Step-by-step explanation:
A
Answer:
The first and third options.
Explanation:
Look at each column and add the number of families.
Check the picture below.
bear in mind that, in an isosceles triangle, the two twin legs departing from the same vertex, will make an equal angle on the other end.
Answer:
Protons in every atom of an element
Step-by-step explanation:
The number of protons in an element is what determines the atomic number. Take Aluminum for instance. There's thirteen protons in the element of aluminum and the atomic number for that element is thirteen.
Hope this helps! :)