The flow/transfer of energy
The answer is- Magnitude of melting point of group 1A metals decreases down the group.
The melting point is the temperature at which a given solid material changes from a solid state to a liquid or melt state.
On what factors, the melting point of an atom depends?
- The melting point is governed by the attraction of the electrons of an atom towards its nucleus.
- Thus, size of the ion plays crucial role. Smaller the size of ion, greater is the attraction and thus greater is the melting point.
- Now, Group 1A elements are also called alkali metals and they include Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.
- As moving down the group, the size of atom increases , thus the attraction between the electrons and nucleus decreases, and thus the melting point decreases.
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Answer:
Electrons are present around the nucleus.
Explanation:
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e⁻
Mass= 9.10938356×10⁻³¹ Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.
Properties of cathode ray:
The ray is travel in straight line.
The cathode ray is independent of composition of cathode.
When electric field is applied cathode ray is deflected towards the positively charged plate.
Hence it was consist of negatively charged particles.
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P⁺
Symbol of neutron= n0
Mass of proton=1.672623×10⁻²⁷ Kg
Mass of neutron=1.674929×10⁻²⁷ Kg
All these three subatomic particles construct an atom. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
It works by moving the water molecules to the place of low concentration until it reaches equilibrium.
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