Answer:
group # = # valence electrons
group 2= 2 valence electrons
Explanation:
Mg is in group #2 and subsequently has 2 valence electrons (electrons on the outermost shell)
B. Air
C. Milk
D. Vinegar in water
Answer:
B
Explanation:
b/c air is not seen by eye
The list which includes elements with the most similar chemical properties is; Choice 3: O, S, Se
First, we must know:
Elements are arranged in 7 Periods and 18 groups in the periodic table.
Additionally, Elements in the same group of the periodic table often have similar chemical characteristics as a result of equal number of Valence electrons.
By considering Choices individually;
For Choice 1: (Br, Ga and Hg)
For Choice 2: (Cr, Pb and Xe)
For Choice 3: (O, S and Se)
For choice 4: (N, O and F)
Ultimately, the correct answer is Choice 3.
Read more:
Answer: The correct answer is Option 3.
Explanation:
Elements are distributed in 7 Periods and 18 groups in a periodic table.
Elements which belong to same group show similar chemical properties because of the same number of valence electrons.
For the given options:
Option 1: Br, Ga and Hg
Bromine is present in Group 17, Gallium is present in 13 and Mercury is present in Group 12.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
Chromium is present in Group 6, Lead is present in Group 14 and Xenon is present in Group 18.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
Oxygen, Sulfur and Selenium are present in Group 16.
As, all the three elements belong to same group. So, they will show similar chemical properties.
Nitrogen is present in Group 15, Oxygen is present in Group 16 and Fluorine is preset in Group 17.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
Hence, the correct answer is Option 3.
b. 17
c. 19
d. more information is needed to figure this out.
Answer:
c. 19
Explanation:
Potassium is a chemical element of the periodic table whose chemical symbol is K, whose atomic number is 19. It is an alkaline metal of white-silver color, which abounds in nature in the elements related to salt water and other minerals. It oxidizes rapidly in air, is very reactive, especially in water, and chemically resembles sodium. It is an essential chemical element.
The K having an atomic number of 19 means that it has 19 protons and in normal conditions for a neutral atom it will have 19 electrons, and being one step away from argon gas makes it extremely unstable.
The decomposition of Nickel(II) hydroxide produces Nickel(II) oxide and water. The chemical equation is: Ni(OH)2 (s) → NiO (s) + H2O (l).
The decomposition reaction of Nickel(II) hydroxide into Nickel(II) oxide and water can be written as follows: Ni(OH)2 (s) → NiO (s) + H2O (l) . In this reaction, solid Nickel(II) hydroxide decomposes into solid Nickel(II) oxide and liquid water. It’s important to remember that in these reactions, a single, complex reactant breaks down into multiple, simpler products.
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The second atom emits light with more energy.
The first and second atoms absorb energy without emitting light.
The first and second atoms emit light with the same amount of energy.
The correct option is this: THE FIRST ATOM EMITS LIGHT WITH MORE ENERGY.
In the question given above, the level 1 mentioned in the question refers to the ground state of the electrons while level 2 and level 3 refer to excited states of hydrogen electrons. When an atom is in an excited state, it possess more energy and it is unstable, thus, it tends to return to the ground state after sometime to attain stability. As the atom return to the ground state, it loses its energy by emitting light. The higher the level of excitation, the more the light that will be emitted when the atom is returning to the ground state. Thus, an atom returning to the ground state from level 3 has more energy and will emit more light when returning to the ground state than an electron in level 2.
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom.
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion.
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.
B is not the correct answer. The -3 charge is distributed over the entire ion, so the correct answer is A.