How does a lithium cation compare to a lithium atom? The cation is larger. The cation has the same radius. The cation is smaller. The cation has the same charge
Answers
Answer:
The cation is smaller.
Explanation:
Electronic configuration of Lithium atom is as follow,
Li = 1s², 2s¹
while, Electronic configuration of Lithium cation is as follow,
Li⁺ = 1s²
The Lithium Cation is smaller because,
i) Less Energy Levels:
As depicted in electronic configurations, the valence shell of Li atom is 2 while, that of Li cation is 1 as a result the distance of valence electrons and nucleus has decreased resulting in small size.
ii) Less Shielding Effect:
The effect in which the core electrons shield the valence electron from nucleus pull is known as shielding effect. In Li cation there are no core electrons hence, the electrons are more attracted towards proton resulting in small size.
iii) More Nuclear Charge:
In Li atom there are three protons and three electrons so, three protons attract three electrons and the game run some what balance. But, as tone electron is lost in Li Cation, the proton side gets stronger and apply more pull on electrons and made them more closer to the nucleus resulting in size decrease.
The correct statement is: The cation is smaller.
In a neutral lithium atom, there are three electrons surrounding the nucleus, distributed in different energy levels or electron shells. These electrons repel each other due to their negative charges, creating an electron-electron repulsion that tends to spread them out and increase the size of the atom.
When a lithium atom loses one electron to form a cation, it becomes positively charged. This loss of an electron reduces the electron-electron repulsion within the atom. With fewer electrons, the remaining electrons experience a stronger attraction towards the nucleus, since the positive charge of the nucleus is no longer balanced by the negative charge of the lost electron.
As a result, the remaining electrons are drawn closer to the nucleus in the lithium cation. The reduction in electron-electron repulsion and the increased attraction between the electrons and the nucleus cause the cation to have a smaller size compared to the neutral atom.
Hence, the lithium cation (Li⁺) is smaller than the lithium atom (Li)
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A (a) is a pure substance that cant be broken down into simpler substances by chemical or physical means a) element b) mineral c) chemical d) atom
Answers
(2) gains an electron
(3) loses a proton
(4) loses an electron
Answers
When a lithium atom forms a Li+ ion, the lithium atom looses an electron. Therefore, option 4 is correct.
What is an electron ?
The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are members of the lepton particle family's first generation, are typically regarded to be elementary particles.
Quarks make up protons and neutrons, but not electrons. We believe that quarks and electrons are basic particles that are not composed of lesser subatomic particles.
Three protons and three electrons make up a lithium atom. It may become an ion if one of its electrons is lost. It now has a net positive charge since there are more positive protons than negative electrons. It is a positive ion as a result.
Thus, option 4 is correct.
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Answer:
(4) loses an electron
it has 3 protons and electrons, proton no. cannot change, to make lithium an ion, it needs to have an exact number of electrons so that the electronic shell can be 2, 8… something like that. So lithium atom loses an electron in order to for Li+ ion. Making the electrons to have 2 as an electronic shell.
B) calcium
C) copper
D) potassium
Answers
A. barium - pale green
B. calcium - yellow red
c. copper - green blue
d. potassium - lilac
Using the visible light spectrum, it can be determined that the metal with the lowest energy is B. calcium. This is because the color yellow-red is near the end of the spectrum with the longest wavelength. Since wavelength is inversely proportional to energy, calcium has the lowest energy.
Answer:
B
Explanation:
The color of the emitted light depends on the energy. According to the arrangement of the electromagnetic spectrum, the color red has the lowest energy, the lowest frequency, and the largest wavelength
Answers
Answer:
The correct formula for boron tribromide is BBr3 (option b).
In this compound, boron (B) has a valency of 3, and bromine (Br) has a valency of 1. The subscript 3 indicates that there are three bromine atoms bonded to one boron atom.
To determine the correct formula, it's important to understand the valencies of the elements involved. Boron typically has a valency of 3, which means it can form three bonds with other elements. Bromine, on the other hand, has a valency of 1, indicating that it can form one bond.
In boron tribromide, the three bromine atoms each form a single bond with the boron atom. So, the formula is BBr3, indicating one boron atom and three bromine atoms.
It's important to pay attention to the subscripts in a chemical formula, as they indicate the number of atoms present in the compound. In this case, the subscript 3 indicates that there are three bromine atoms bonded to one boron atom. If the formula were written as B3Br or 3BBr, it would imply that there are three boron atoms, which is incorrect.
Remember, when writing chemical formulas, it's crucial to consider the valencies and the number of atoms involved to accurately represent the compound.
Answer: b. BBr3
Explanation:
When we see prefixes such as mono-, di-, and tri-, that indicates the number of atoms of that element. So, tribromide means that there are 3 atoms of bromide. Boron has no prefix, so there is only 1 atom of boron.
So, our final formula is BBr₃.
I hope this helps! :)
2)
3)
4)
Can someone help me with this one ?
Answers
Answer is 3) - H₂O(s) → H₂O(g)
Sublimation can be defined as the type of phase conversion of a substance which is in its solid phase to a gaseous phase without going through its liquid phase.
According to the given choices only third one is correct because solid H₂O goes to its vapor without going liquid state.
b. S
c. H₂
d. Ne
e. C
Answers
The substance that combined with the oxygen to form a greenhouse gas has been carbon (C). Thus, option E is correct.
The greenhouse gases have been responsible for the entrapment of the sun's energy in the atmosphere, leading to the increase in the temperature of earth and making earth an appropriate place to live.
The greenhouse gases have been the carbon dioxide, methane, sulfur etc. that are able to entrap the energy.
The reaction of carbon with oxygen has been resulted in the formation of carbon dioxide. It has been a green house gas.
Thus, the substance that combined with the oxygen to form a greenhouse gas has been carbon (C). Thus, option E is correct.
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