Question

K'Ais an element which atomic number is 17. 'B' is another element consisting atomic mass 1
1. What is nucleon number?
b. Why the last electron of K element goes to 4s orbital instead of 3d?
c. Why Bhor model is more effective than Rutherford model to explain the electronic configuration of 'A'? Explain.
d. Define the position of 'B' in modem periodic table.

Please answer it properly and correctly (to you guys)

Answer 1

Answer:

the number of neutrons plus electrons

Explanation:

Answer 2

1)A nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus. The number of nucleons in a nucleus defines an isotope's mass number (nucleon number). Until the 1960s, nucleons were thought to be elementary particles, not made up of smaller parts.

b)We say that the 4s orbitals have a lower energy than the 3d, and so the 4s orbitals are filled first. We know that the 4s electrons are lost first during ionization. The electrons lost first will come from the highest energy level, furthest from the influence of the nucleus.

c)Bohr's improvement of the Rutherford model was that Bohr placed the electrons in distinct energy levels.Rutherford described the atom as consisting of a tiny positive mass surrounded by a cloud of negative electrons. Bohr thought that electrons orbited the nucleus in quantised orbits.

d)Hydrogen has no fixed position in the modern periodic table. It resembles both alkali metals and halogens. It is being placed above lithium in the periodic table.

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