The elements of which group are nonreactive?
Answers
The elements react with other element and form compounds in order to complete their octet (possess 8 electrons in their valence shell) and attain stability. The formation of compounds by the elements can take place by either sharing of electrons or transfer of electrons from one atom to other atom. The elements whose octet is complete that means those elements which has eight electrons in their valence shell are nonreactive as they are already stable due to completion of octet.
In periodic table, the elements of group 18 (Noble gas) have their octet completely filled and are stable in the elemental form. Thus, the elements of group 18 (helium, neon, argon, krypton, xenon, radon, and oganesson) are nonreactive.
Final answer:
The noble gases in Group 18 are nonreactive due to their filled valence shells, but exceptions to this rule have been discovered
Explanation:
The elements in Group 18, also known as the noble gases (helium, neon, argon, krypton, xenon, and radon), are nonreactive. They have filled valence shells, which makes them stable and unreactive. However, it's important to note that this assumption was proven false by Dr. Neil Bartlett in 1962 when he discovered that some noble gases can react under certain conditions.
Thus, these specific gases are a group of chemical elements found in Group 18 of the periodic table and are typically characterized by their overall stability and lack of reactivity, making them useful in applications like lighting, lasers, and cryogenics.
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One positive attribute of dietary fat is that it's a good source of A. water. B. vitaminc. C. energy. D. boron.
Pleaseeee helpp its a HW questionwill mark brainliest!!
2. It is the simplest ratio of atoms in a formula unit.
3. It represents the true molecular mass of a chemical formula.
4. It represents the highest ratio of coefficients in a chemical formula.
Answers
Answer:
2. It is the simplest ratio of atoms in a formula unit.
Explanation:
The empirical formula refers to how to provide the minimum proportion in which chemical elements combine into one substance. Sometimes it may happen that the minimum formula is equal to the molecular formula of the compound; However, this is not always true. In short, the empirical formula refers to the simplest ratio of atoms in a unit of formula.
For example, the empirical or minimal formula of water is H2O, indicating that there is a 2: 1 ratio between the elements that make up water molecules. And, coincidentally, this is also the molecular formula of water.
Answers
so rearranged mass = volume x density
mass = 8.920 x 45 = 401.4g
rearrange (there are 1000grams in 1kg)
volume = mass/density
volume = 1000/8.920
volume = 112.1076233cm3
Answers
Complete question is;
Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper) is called what?
Molding is what a child does with Play-Doh or origami
Answer:
Modeling
Explanation:
In chemistry, we have a branch called modeling chemistry. In modeling, we organize together a series of models instead of a collection of topics. In this approach, we will begin with a phenomena that can be readily observed and are gradually develop the simplest model of matter that helps us make sense of our observations.
Now in the question, we are Molding a shape from soft, malleable materials like clay/plaster or constructing from harder materials like metal/paper. This means that we are organizing a series of models from either soft & malleable or harder materials to produce a simple model shape.
Thus, this is simply modeling.
B. 6
C. 18
D. 36
**MY answer: C. 18
Which of the following is a homogenous mixture of two or more pure substances?
A. oxygen
B. water
C. air
D. alcohol
**MY answer: D. alcohol
are they correct???
Answers
Your answer is correct
Which of the following is a homogenous mixture of two or more pure substances?
C. air
Your answer is wrong.
Answer:
1) The correct answer is option C.
2) the correct answer is option C.
Explanation:
1) Molecular formula of glucose =
Number of carbon atoms in single molecule = 6
Number of carbon atoms in 3 molecule of glucose :
of carbon
There are 18 carbon atoms in the 3 molecules of glucose.
2) Homogeneous mixture is the mixture in which components are evenly distributed throughout the mixture. The shape and size of the particles are identical in the mixture.
Heterogeneous mixture is the mixtures in which component are unevenly distributed throughout the mixture. The shape and size of the particles are not identical in the mixture.
Air is the mixture of gases with 78% of nitrogen gas, 21% of oxygen gas and remaining 1 % are other gases. Air is a homogeneous mixture of different gases.
Where as water, oxygen , alcohol are pure substances.
Answers
(1) 539°C (3) 7°C(2) –539°C (4) –7°C
Answers
The freezing point of bromine is –7°C. Therefore, the correct option is option D among all the given options.
What is bromine?
Bromine (Br) is a chemical substance, a deep red toxic liquid, and a member of Group 17 (Group VII) of both the periodic chart. At room temperature, free bromine seems to be a reddish brown fluid with such a significant vapour pressure.
Bromine vapour has an amber color. Bromine has a strong odor and can irritate the skin, eyes, especially respiratory system. Even brief exposure to intense bromine vapour can be lethal. The freezing point of bromine is –7°C.
Therefore, the correct option is option D.
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