The molecular structure of water contains two atoms of hydrogen and one atom of oxygen. When water reaches its boiling point and turns into water vapor, what happens to its molecular structure?
Solution 1
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for example group Alkali Metals are the most metallic, so they will be written first.
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Answer: The answer is solution
Explanation:
Reactivity series is an empirical progression of a series of metals, arranged by their reactivity from highest to lowest (alkaline metals have highest reactivity and Noble metals lowest reactivity). This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
Bismuth will not have the same number of valence electrons.
What is valence electrons?
Valence electrons are those that are found in an atom's outermost electron shell. These electrons are involved in bonds and reactions because they are the farthest from the nucleus and as a result are less tightly held by the atom.
This implies that an element's reactivity, electronegativity, and the number of bonds it may form are all dependent on the number of valence electrons it possesses. The ability of an element to create bonds with other atoms is referred to as valence.
The number of hydrogen atoms an element can bond to (which is determined by how many valence electrons are available for bonding) has historically been used to determine an element's valence.
Therefore, Bismuth will not have the same number of valence electrons.
To learn more about valence electrons, refer to the link:
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Answer: The correct answer is bismuth.
Solution:
Bismuth is the member of group 15 of the periodic table.
Bismuth contains five valence electrons in its valence shell. Which can be seen from its electronic configuration:
Where as other three elements are the members of group 14 of the periodic table with three valence electrons in their respective valence shells.
Answer is: Ba (barium).
Barium is metal from second group of periodic table of elements. Barium looses two electrons and has oxidation number +2.
Chromium has different oxidation numbers, usually +3 and +6, iron has oxidation numbers +2 and +3, copper +1 and +2 in their compounds.
Answer:
Answer is: Ba (barium).
Explanation:
Answer: Option (b) is the correct answer.
Explanation:
When there is no change in chemical composition of a substance  then this change is known as physical change.
Where as when there is change in chemical composition of a substance then it is known as chemical change.
When sugar is heated, it results in the formation of carbon dioxide and water. This means that composition of sugar has changed thus, it is a chemical change.
When solid ice is melted, it turns into liquid. This shows that only state of water has changed. There is no change in chemical composition because when we freeze water then again liquid water changes into solid ice. Thus, it is a physical change.
When sodium reacts with chlorine then the reaction is as follows.
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It shows that chemical composition of sodium has changed due to the formation of sodium chloride. Thus, it is a chemical change.
Also, when aluminium is is heated in air then it results in the formation of aluminium oxide. This means that the chemical composition of aluminium has changed.
Hence, we can conclude that out of the given options, solid ice, when heated, turning into liquid water is an example of a physical change.