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Edufirst
You have to use this knwoledge:

1) The superscript number on the left of the symbol is the mass number (A)

2) The underscript number on the left of the symbol is the atomic number (Z)

3) The atomic number, Z, is the number of protons of the atom.

4) The number of electrons of an atoms is equal to the number of protons.

5) The mass number, A is equal to the number of neutrons, N, plus the number of protons, Z, i.e. A = N + Z, from which you obtain N = A - Z

Now I am going to apply above rules to solve the three cases for you.

I will use other notation just because the editor does not permit to place superscripts and underscripts on the left of the symbol.

a) 62 Cu 29 and 62 Zn 39

62 Cu 29:

Z = 29 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 29 = 33
Number of electrons = number of protons = 29

62 Zn 39:

Z = 39 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 39 = 23
Number of electrons = number of protons = 39

Answers:

protons are not equal
neutrons are not equal
electrons are not equal.

b) 40Ar18 and 41K19

40Ar18:

Z = 18 = number of protons
A = 40 = N + Z => N = 40 - 18 = 22 = number of neutrons
number of electrons = number of protons 18

41K19:

Z = 19 = number of protons
A = 41 = N + Z> N = 41 - 19 = 22
number of electrons = number of protons = 19

Answers:

protons are not equal
neutrons are equal
electrons are not equal

c) 14N7 and 15N7

14N7:

Z = 7 = number of protons
A = 14 => N = 14 - 7 = 7 = number of neutrons
number of elecfrons = number of protons = 7

15N7:

Z = 7 = number of protons
A = 15 => N = 15 - 7 = 8 = number of neutrons
number of electrons = number of protons = 7

Answers:

protons are equal
neutrons are not equal
electrons are equal
mariejoepagaduan

⁶²₂₉Cu and ⁶²₃₀ Zn:

  • Protons are NOT equal
  • Electrons are not equal
  • Neutrons are not equal

⁴⁰₁₈ Ar and ⁴¹₁₉K:

  • Protons are not equal
  • Electrons are not equal
  • Neutrons are equal

¹⁴₇N and ¹⁵₇N:

  • Protons are equal
  • Electrons are equal
  • Neutrons are not equal

FURTHER EXPLANATION

The nuclear symbol is typically used to represent isotopes of an atom. Isotopes are variations of atoms of an element. Isotopes have different numbers of neutrons than other forms of the atom.

The nuclear symbol has three parts: symbol of the element, the atomic number, and the mass number. The general notation for the nuclear symbol of an element is: ᵃₙX   where a is the mass number and n (or typically z) is the atomic number.

The mass number, a, is the total number of protons and neutrons in the nucleus of an atom.

The atomic number is the number of protons in the nucleus of a neutral atom.

The difference between the mass number and the atomic number is the number of neutrons in the isotope.

Another notation used to represent isotopes is the hyphen notation. This notation uses the name of the element, a hyphen followed by the mass number of the isotope. For example, the isotope ¹²₆C can also be represented using the hyphen notation as carbon - 12.

Learn More

  • Isotopes brainly.com/question/419606
  • Periodic Table brainly.com/question/1446926

Keywords: protons, electrons, neutrons

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