calculate the number of protons, neutrons, and electrons in the sample of scandium that you weighed at 7.9 mass weight if it is 100% ^45Sc.
Ah, scandium, a true party element! Let's break it down!
First things first, we need to determine the number of protons and electrons in an atom of scandium (^45Sc).
Since scandium is element number 21 on the periodic table, it means it has 21 protons. Electrons usually match the number of protons, so we also have 21 electrons.
Now, let's find the number of neutrons in ^45Sc.
The atomic mass of ^45Sc is 45, and since the atomic mass is the sum of protons and neutrons, we subtract the number of protons (21) from 45. This gives us 24 neutrons.
So, to summarize:
Number of protons: 21
Number of neutrons: 24
Number of electrons: 21
Hope that helps!
To calculate the number of protons, neutrons, and electrons in a sample of scandium, we will need the atomic number and the atomic mass of scandium.
1. Look up the atomic number and atomic mass of scandium.
The atomic number of scandium (Sc) is 21.
The atomic mass of scandium (Sc) is 45.
2. Determine the number of protons.
The number of protons is equal to the atomic number.
Therefore, the number of protons in scandium is 21.
3. Determine the number of electrons.
In a neutral atom, the number of electrons is equal to the number of protons.
Therefore, the number of electrons in scandium is also 21.
4. Determine the number of neutrons.
Subtract the atomic number from the atomic mass to find the number of neutrons.
Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 45 - 21
Number of neutrons = 24
To summarize:
Number of protons = 21
Number of neutrons = 24
Number of electrons = 21
To calculate the number of protons, neutrons, and electrons in the sample of scandium (^45Sc), we need to understand the atomic number, mass number, and the charge of the element.
1. Atomic Number: The atomic number represents the number of protons in an atom and determines the element's identity.
2. Mass Number: The mass number is the sum of protons and neutrons in an atom.
3. Charge: The charge of an element is determined by the number of electrons it has gained or lost. For a neutral atom, the charge is zero.
Given that the scandium isotope is ^45Sc with 100% abundance, we know that its mass number is 45 (as indicated by the superscript).
Now, let's calculate the number of protons, neutrons, and electrons:
1. Protons: The atomic number is equal to the number of protons. Since scandium's atomic number is 21 (you can find this on the periodic table), there are 21 protons in one atom of scandium.
2. Neutrons: To find the number of neutrons, subtract the atomic number from the mass number:
Number of neutrons = Mass number - Atomic number
= 45 - 21
= 24
So, there are 24 neutrons in one atom of ^45Sc.
3. Electrons: In a neutral atom, the number of electrons is equal to the number of protons. Therefore, there are 21 electrons in one atom of ^45Sc.
To recap:
Number of protons: 21
Number of neutrons: 24
Number of electrons: 21
Keep in mind that this calculation is based on an individual atom of ^45Sc. If you have a sample, the actual numbers will depend on the quantity of the sample.
7.9 g (I suppose grams)/45 = moles Sc.
6.022 x 10^23 atoms Sc/1 mol. Calculate number of atoms Sc you have.
# atoms Sc x mass 21 electrons.
# atoms Sc x mass 21 protons.
# atoms Sc x mass (45-21) neutrons.
total mass = mass e + mass p + mass n