EjerciciosFyQ

True or false about atoms (8309)

F_y_Q — 2024-09-14T03:29:36Z

Decide whether the following statements are true or false. Explain the reason if you find them false:

a) An atom is different from an ion.

b) Atoms have more electrons than protons.

c) Two cations attract each other only if they are in contact.

d) Carbon atoms can be better conductors than potassium atoms.

a) TRUE.

b) FALSE. Atoms are neutral species, unlike ions, so they must have the same number of protons as electrons.

c) FALSE. They do not attract in any case because they are particles with the same charge, so they repel each other instead of attracting.

d) FALSE. Potassium is a metal and therefore has higher electrical conductivity than carbon, which is a non-metal. The allotropic form of carbon called graphite is conductive, but its conductivity is about ten times lower than that of potassium, making it a worse conductor.

Calculation of the number of protons, electrons and neutrons knowing A and Z (8283)

F_y_Q — 2024-08-10T16:50:32Z

If Z = 47 and A = 108, how many electrons, protons, and neutrons does this element have?

The atomic number is, by definition, the number of protons in an element. Therefore, the number of protons is 47. If the element is neutral, it must have the same number of electrons as protons to ensure the sum of the charges is zero. Therefore, it has 47 electrons. To determine the number of neutrons, subtract the atomic number from the atomic mass, which is the sum of protons and neutrons:

(108 - 47) = 61 neutrons.

Atomic number and atomic mass (3444)

F_y_Q — 2016-01-06T04:08:49Z

An element has an atomic number of 10 and an atomic mass of 20. How many neutrons does this element have?

The atomic mass represents the total number of protons and neutrons in the nucleus of the atom. By subtracting the number of protons from the atomic mass, you can determine the number of neutrons.

Z = 10 ('Z' represents the number of protons) and A = 20 ('A' represents the total number of protons and neutrons):

Number of neutrons is (A - Z):

Neutrons = 20 - 10 = 10 neutrons.

Question about nucleus of the atom (3443)

F_y_Q — 2016-01-05T06:15:39Z

The nucleus of an atom is composed of uncharged particles as well as the following:
a) Electrons
b) Protons
c) Neutrons
d) Ions

- Atomic structure / Molecules and atoms, Atomic particles, SOLVED