Question

The element boron (B, atomic number 5 and atomic mass 11) is right above aluminum (Al, atomic number 13 and atomic mass 27) in the periodic table. How many more electrons does aluminum have than boron? Why?



Question 13 options:

There are 8 more electrons in aluminum because you subtract the atomic number of boron from aluminum. 13-5=8


There are 14 more electrons in aluminum because you subtract the atomic number of aluminum from its atomic mass. 27-13=14


There are 16 more electrons in aluminum because you subtract the atomic mass of boron from aluminum. 27-11=16


You can't determine how many more electrons aluminum has than boron from this information.

Answer 1

Answer : The correct option is "There are 8 more electrons in aluminum because you subtract the atomic number of boron from aluminum. 13-5=8"

Explanation :

The elements are arranged on periodic table in increasing order of their atomic numbers.

The atomic number of an element represents the number of protons. In case of neutral atom, this number also represents the number of electrons.

The atomic number of Boron is 5 , that means it has 5 electrons. The atomic number of Aluminium is 13, that means it has 13 electrons.

Therefore we can say that there are 13 - 5 = 8 more electrons in Aluminium.

The correct option is "There are 8 more electrons in aluminum because you subtract the atomic number of boron from aluminum. 13-5=8"

Answer 2

Correct answer is D

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