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Sagot :
Hydrogen and Potassium have the same C. number of valence electrons
Further explanation
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
- s: 2 electrons
- p: 6 electrons
- d: 10 electrons and
- f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Determination of electron configurations based on principles:
- 1. Aufbau: Electrons occupy orbitals of the lowest energy level
- 2 Hund: electrons fill orbitals with the same energy level
- 3. Pauli: no electrons have the same 4 quantum numbers
Hydrogen (with the symbol H) is a non-metallic element located in group 1A with an atomic number 1 and an atomic mass of 1,008 g / mol,
Electron configuration: 1s1
Potassium (with the symbol K) is a metal element located in group 1A with an atomic number 19 and an atomic mass of 39.10 g / mol,
Electron configuration: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s¹ or simply [Ar] 4s¹
- A. atomic mass
The two elements have different atomic masses
H: 1,008 g / mol,
K: 39.10 g / mol
- B. total mass of neutrons
The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.
So atomic number = number of protons = number of electrons
Mass Number (A) is the sum of protons and neutrons
Mass Number (A) = Number of protons + Number of Neutrons
So that the relationship between atomic numbers and mass numbers can be formulated as follows:
Atomic Number (Z) = Mass Number (A) - Number of Neutrons
the mass of each basic particle in atomic mass units is:
electron mass = 9.11.10⁻²⁸ grams
proton mass = 1.6726.10⁻²⁴ grams
neutron mass = 1,675.10⁻²⁴ grams
The number of neutrons in the element H
Mass Number - Atomic Number = 1 - 1 = 0
then the neutron mass of the atom H = 0
The number of elemental neutrons K
Mass Number - Atomic Number = 39.1 - 19 = 20.1
then the neutron mass of the atom K = 20.1 x 1,675.10⁻²⁴ grams = 3.35.10⁻²³ g
So that the two elements have different neutron masses
- C. number of valence electrons
Valence electrons are electrons in the outer electron shell.
the valence electrons of the H element are 1 (1s1, in the first shell)
While the valence electron element K is also 1 (4s¹, in the fourth shell)
So both have the same valence electron
- D. number of filled energy levels
The main quantum number (n) indicates the energy level of the orbitals. The greater the value of n, the greater the size of the orbitals and the higher the energy level
Element H only fills 1 sub-shell energy level (in skin K, n = 1)
Whereas the K element fills up to 4 subshell energy levels (on skin N, n = 4)
Learn more
maximum numbers of electrons
https://brainly.ph/question/2089239
electrons in the highest occupied energy level
https://brainly.ph/question/74428
the electron configuration
https://brainly.ph/question/1774237
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