What neutral atom has a nuclear charge of +9, and a nuclear mass of 19 amu? How many neutrons does it have. How many electrons does it have ?

Question

Please help me I'm really wor 😩 

Answer 1

Examine a periodic table of the elements, and you will find that fluorine (F) is the 9th element in the table.  That means its atomic number number Z is 9, which equals the number of protons in its nucleus, and the number of electrons in its electron shell (if not ionized).  The 19 amu means it has A = 19 nucleons (protons and neutrons) in its nucleus,  Since 9 of them are protons, that means it has 10 neutrons in its nucleus.

 

Summary:

 

Element is fluorine, F

Z = 9

A = 19

Answer 2

Hello Nun.

 

The nuclear charge is determined by the number of protons,

the nuclear mass in amu's is detemined by the number of protons and neutrons (p+n).

Each proton carries a charge of +1, each neutron 0, and each electron a charge of -1.

So, a neutral atom has the same number of protons and electrons, and

in general, an atom has a charge of (#number of protons) - (# of electrons).

 

The number of protons also determines what the element is: 1 proton is the first element or Hydrogen,

2 protons, second element or Helium, etc.

 

Can you figure out the answers by yourself now?

 

 

 

 

 

 

Nuclear charge +9: 9 protons, fluorine or F.

# of neutrons = 19 - 9 = 10.

Neutral atom, so (# of electrons) = (# of protons) = 9.