Answers:
a) 18 protons, 22 neutrons and 18 electrons
b) 30 protons, 35 neutrons and 30 electrons
c) 31 protons, 39 neutrons and 31 electrons
d) 35 protons, 45 neutrons and 35 electrons
e) 74 protons, 110 neutrons and 74 electrons
f) 95 protons, 148 neutrons and 95 electrons
Explanation:
When we search an element in the Periodic Table, we can find its Atomic number (Z) and its Mass number (A).
Let's talk about them:
Assuming we are deailling with neutral atoms, which have the same number of electrons as number of protons, the atomic number Z indicates us the number of protons and electrons an atom has.
On the other hand, the mass number A gives us information about the number of protons and neutrons in the atom:
A=Z+number of neutrons
Hence:
number of neutrons=A-Z
So, taking this into account let's begin with the answers:
Z=18
A=39.948 u
number of neutrons=39.948-18=[tex]21.948 \approx 22[/tex]
This means the Argon atom has:18 protons, 22 neutrons and 18 electrons
Z=30
A=65.38 u
number of neutrons=65.38-30=[tex]35.38 \approx 35[/tex]
This means the Zinc atom has: 30 protons, 35 neutrons and 30 electrons
Z=31
A=69.723 u
number of neutrons=69.723-31=[tex]38.72 \approx 39[/tex]
This means the Gallium atom has: 31 protons, 39 neutrons and 31 electrons
Z=35
A=79.904 u
number of neutrons=79.904-35=[tex]44.904 \approx 45[/tex]
This means the Bromine atom has: 35 protons, 45 neutrons and 35 electrons
Z=74
A=183.84 u
number of neutrons=183.84-74=[tex]109.84 \approx 110[/tex]
This means the Wolframium atom has: 74 protons, 110 neutrons and 74 electrons
Z=95
A=243 u
number of neutrons=243-95=148
This means the Americium atom has:95 protons, 148 neutrons and 95 electrons
