Question

Using the periodic table entry below, match the phrases with their corresponding values. Potassium 1.) number of protons 2.) atomic mass 3.) number of electrons in the n=1 shell 4.) number of electrons in the n=3 shell 5.) number of neutrons __20 __2 __8 __39 __19

Answer 1

Answer:

1) Atomic no. = no. Of proton

No. OF proton = 19

2) 39

3) 2

4) 8

5) 20

Answer 2

1. number of protons                                      19        

2. atomic mass                                               39  

3. number of electrons in the n = 1 shell        2  

4. number of electrons in the n = 3 shell        8  

5. number of neutrons                                     20  

An atom is made up of three fundamental particles.

Protons are the positively charged particles found in the nucleus with the neutrons. Neutrons do not carry any charges.

Both proton and neutron add up to give the mass number of an atom. Electrons have negligible mass and they are negatively charged.  

Atomic mass = Number of protons + Number of neutrons.

From the given options:  

number of protons will be 19 and it is the same as number of electrons

The atom is potassium.