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Vesna [10]
3 years ago
12

In the 1700s, Isaac Newton determined that the force of gravity between two objects depends on the mass of the objects and dista

nce between them. He reasoned that things fall toward Earth because it has so much mass. Then in the 1900s, Albert Einstein worked with new discoveries, such as the fact that light always travels the same speed, and he determined a new explanation of how and why gravity works. Mass and distance still matter in Einstein’s explanation, but speed also matters. Newton’s explanation still works for objects close to Earth, but Einstein’s explanation works for all of the objects in the universe.
Chemistry
2 answers:
Alexxx [7]3 years ago
6 0

Answer:

Scientists make improved explanations by building on old ideas and working with new data.

Explanation:

Kobotan [32]3 years ago
6 0
That is a good explanation good job
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Referring only to the periodic table, tell:
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a) Both fluorine and chlorine are in the same group in periodic table.

b) They differ in their atomic radius and electronegativity.

c) Because they have the similar number of electrons in their outer shell.

Explanation:

a) Electronic configuration of chlorine and fluorine are similar because these two elements belong to the same group number 17 of the periodic table as they have the same number of electrons in their outer or valence shell. These are called as halogens and are highly reactant.

F - 1s2,2s2,2p5    (9)

Cl- 1s2,2s2,2p6,3s2,3p5  (17)

b. The atomic radius of chlorine and fluorine are different because fluorine is on top of chlorine in the group. We know as we go down in a group in the periodic table the atomic radius increases though they have the same number of electrons in their outer shell electronegativity decreases. Fluorine is the most electronegative element of the periodic table.

c) Iodine and bromine are also the members of group 17, although their atomic numbers are different they have same valence electrons as chlorine and fluorine.

Iodine electronic configuration: 1s2,2s2,2p6,3s2.........4d10,5s2,5p5.

Bromine electronic configuration: 1s2,2s2,2p6,3s2,........3d10,4s2,4p5

Chlorine electronic configuration: 1s2,2s2,2p6,3s2,3p5

We can observe the outer shell having same number of electrons.

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