The atomic and
mass number as well as the number of protons and neutrons in an atom are
related, in fact sometimes they can be use used interchangeably.
In brief, in a nucleus of an atom, there are protons and neutrons, the number of protons is
called the atomic number, the sum of the protons and the neutrons is called the
mass number, but the problem here is how can you use an
atom's mass number and atomic number to determine the number of protons
electrons and neutrons in the atom?
This problem
is solved here , A is our atomic mass, Z is the atomic number or number of
protons while N, is the number of neutrons.
Therefore A= Z + N,
Z =A-N
And N =A-Z.
Below are
some problem that will show you how to determine an element protons
neutrons and electrons.
1. how many electrons does a neutral atom
with four protons contain
in an
neutral atom, the number of charge on the positive nucleus most be balanced by
the total charges on the electrons, each
protons has a single positive charge likewise each electron has a single
negative charge, for the atom to be neutral the number of the protons must be
equal to tat of the electron. Therefore if protons are 4 then electrons are
also four.
2. How many electrons does a neutral atom
with 4 protons and 3 neutrons have?
A neutral
atom with four protons has four electrons also.
3. According to coulomb law how does distance
affect the electric force.
The force is
inversely proportional to the distance between the charges, this means if the
charges are closer the attraction or repulsion is greater whereas is they are
far the electric fore is weak.
4. How many electrons does a neutral atom
with 6 protons and 5 neutrons have
A neutral
atom with 6 protons must have 6 electrons
5. how many electrons does a neutral atom
with 4 protons and 3 neutrons have?
A neutral
electron with 4 proton must have 4 electrons also, the number of neutron has no
effects.
6. What is the elemental symbol for an atom
with 20 protons 21 neutrons and 22 electrons
The atom
with 20 protons is the calcium, ca+2, it has atomic number of 20 and atomic
mass of (20 +21) 41.
7. how many electrons does a neutral atom
with four protons contain?
It must have
4 electrons also.
8. How many electrons does a neutral atom
with 6 protons and 5 neutrons have
A neutral
atom with 6 protons must have 6 neutrons.
9. what is the elemental symbol for an atom
with 13 protons 17 neutrons and 12 electrons?
The element
with 13 protons must be aluminum, with
13 protons and 10. electrons means it has receive one electrons,
it must be a non-metal, confusion, the question is not correct.
11. Which is the nuclide notation for an atom
with 18 protons and 22 neutrons
The atom is
argon, 30Ar, it has a mass of
30 and atomic number of 18.
12. How many electrons does a neutral atom with
2 protons and 3 neutrons have
It has 2 electrons also. The atom is helium-5
13. Which is the nuclide notation for an atom
with 15 protons and 16 neutrons
It has 15
electrons also, the atom is phosphorus-31, because the charges must cancel out.
14. How many electrons does a neutral atom with
6 protons and 5 neutrons have
The atom is
carbon-11, it must have 6 electrons,
15. An atom with 12 electrons 13 neutrons and 11
protons is
The atom is
magnesium, the isotope is magnesium-24
16. which is the nuclide notation for an atom with
15 protons and 16 neutrons
The nuclide
is 31P, the mass is at the
superscript .s
17. what is the elemental symbol for an atom
with 7 protons 6 neutrons and 5 electrons
The element
is nitrogen, the symbol is n,
18. An atom with 12 electrons 13 neutrons and 11
protons is a(n) ___
The atom is
magnesium, but it cannot have 12 electrons because it is a metal.
19. which is the nuclide notation for an atom
with 13 protons and 5 neutrons
The nuclear notation for it is 18Al
20. an isotope with a mass number of 24 and 13
neutrons the atom is ?
To know the
atom, we have to find the atomic number, 24-13=11, the atom is sodium
21. What is the atomic mass number of an isotope
that has an atomic number of 5 and includes 6 neutrons
The atomic
number is the number of protons in the
nucleus in the atom , the atomic
mass is the sum of the protons and neutrons. Therefore 6+5 =11,
the mass is 11, the isotope is carbon-11
22. What is the mass number of the hydrogen
isotope that contains 2 neutrons
The mass is
the sum of protons and neutrons , therefore hydrogen has only one proton in all
its isotopes , therefore, 1+2 =3 , the mass is 3.
23. What is the mass number of an oxygen isotope
that has nine neutrons
Oxygen has 8
protons, the mass number will be 8 +9 =17.
24. If a hydrogen atom has 2 neutrons and 1
proton what is its mass number
The mass
number is 3.
25. What is the mass number of an iron atom that
has 28 neutrons
The mass
number is the sum of protons and neutrons,
the number of protons in iron is 26, 26 +28 =54, a =54.
26. What is the mass number of an iron atom that
has 31 neutrons
The number
of protons is 26 , mass number = 26 +31= 57.
27. if a hydrogen atom has a mass of 3 is it an
isotope what is its called,
It is called
deuterium
28. What is the mass number of an atom of
potassium that has 20 neutrons
The mass
number will be 19 +20 =39, the atomic number of potassium is 19.
29. What is the mass number of an iron atom that
has 29 neutrons
26 +29=55,
the mass number of this isotope is 55.
30. A neutral atom has a mass number of 80 and
has 45 neutrons what is the symbol
To know the
symbol we need to know the atomic number, from
the above datas, the mass is 80,
the neutron number is 45, therefore , the number of protons is 80-45=35. The atom is bromine, the symbol is 80Br.
31. How is the mass number related to the number
of protons and neutrons an atom has?
The mass
number is the sum of nucleons (protons and neutrons ) in an atom
32. What do the superscript and subscript in the
notation 4019k represent
The super
script represent the mass number , 40K
while the subscripts represents the atomic number 19K.
33. How can you determine the number of neutrons
in an atom if its mass number and its atomic number are known
To determine
the number of neutron, we subtracts the
atomic number from the mass number, the atomic is the number is the number of
protons while the mass number is the sum of protons and neutrons .
34. How many protons and electrons are contained
in an atom of element 44
There are 44
protons and 44 electrons in the element.
35. What do the superscript and subscript in the
notation k represent
Go to
question 32.
36. What is the mass number of an atom that has
12 neutrons and 11 protons
The mass
number is the sum of protons and neutron therefore is 23.
37. If an atom has 34 protons and 40 neutrons
what is its mass number
The atom has
a mass (34 +40) =74, the atom is selenium-74.
38. How to write the sodium isotope with 13
neutrons
The sodium
has atomic number of 11, meaning 11 protons therefore the mass number is
11+13=24.
39. The magnesium isotope with 13 neutrons what
is its mass
The magnesium
has atomic number of 12, meaning 12 protons, therefore the mass is (12
+13) =25
40. The aluminum isotope with 13 neutrons, what
is the mass
The aluminum
has atomic number of 13, the atomic mass will be
41. The oxygen isotope with 7 neutrons what is
its mass.
Atomic
number of oxygen is 8, the mass is 8 +7 =15, oxygen-15
42. what are atoms of the same element that have
a different number of neutrons
They are
called isotones,
43. What is the mass number for an oxygen atom
that has 10 neutrons in its nucleus
The mass
number is the sum of protons and neutrons, 10 + 8 = 18 , the mass number is 18.
No comments:
Post a Comment