Question

iii by looking at the atomic number we are able to observe how many protons an element has. how many protons do the following elements have? 14 __ si 16 al 18 tc 15 ne 17 cu 19 __ fe

Explanation:

Step1: Recall atomic - number property

The atomic number is equal to the number of protons in an atom.

Step2: Match atomic numbers with elements

For Si (Silicon), atomic number is 14, so number of protons = 14.
For Al (Aluminum), atomic number is 13 (not 16 as given wrongly in the question, but based on correct knowledge), number of protons = 13.
For Tc (Technetium), atomic number is 43 (not 18 as given wrongly), number of protons = 43.
For Ne (Neon), atomic number is 10 (not 15 as given wrongly), number of protons = 10.
For Cu (Copper), atomic number is 29 (not 17 as given wrongly), number of protons = 29.
For Fe (Iron), atomic number is 26 (not 19 as given wrongly), number of protons = 26.

Answer:

14, 13, 43, 10, 29, 26