Option C - Electrons are outside the nucleus and and have a negative charge is the correct alternative.
We have electrons.
We have to determine their role inside the atom.
An electron is one of the subatomic particles within an atom. It is negatively charged particle whose magnitude is 1.6 x 10⁻¹⁹ C.
According to the question -
The role of electrons inside the atom is as follows -
Hence, Option C is the correct alternative.
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(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition
Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.
Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.
Therefore, the correct option is option 2.
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Answer:
The answer is Carbon
Explanation:
Organic compounds are considered to be all those chemical substances that contain some carbon atom in their molecule. Besides carbon, hydrogen is an important element in its constitution.
Carbon molecules unite with each other very easily, developing basic skeletons in all organic compounds. These chains can have different lengths and shapes.
Each carbon atom has a valence of 4 and the bonds in organic compounds are covalent, with the possibility of double or triple bonds.
Organic compounds can also contain other types of chemical elements other than carbon (oxygen, nitrogen, sulfur, etc.) called functional groups. A wide variety of organic compounds are formed from these functional groups.
The order of placement of the elements on the modern Periodic Table is determined by their atomic number (option A)
The atomic number of an element is the number of protons in the nucleus of an atom of that element. It is a unique identifier for each element, and it is the primary factor that determines the chemical properties of an element.
The Periodic Table is arranged in horizontal rows, called periods, and vertical columns, called groups. The order of placement of the elements on the modern Periodic Table is determined by their atomic number.
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The order of placement of the elements on the modern Periodic Table is the atomic number. The answer is number 1. The rest of the choices do not answer the question above. Atomic mass gives the number of mass of an atom.
Answer:
It is used to represent whole numbers
Explanation:
Pb + Cu(CIO), → Pb(ClO3)2 + Cu
Answer:
No.
Explanation:
Pb (lead) is higher on the activity series than Cu (copper). Since Cu is lower, no reaction forms.
a. True
b. False
Acid precipitation is caused by the release of pollutants such as sulfur dioxide and nitrogen oxides when fossil fuels are burned. These pollutants combine with water in the atmosphere to form acids, which can fall to the earth as precipitation.
The statement in the question is True. Acid precipitation can indeed be traced back to the burning of fossil fuels. When we burn fossil fuels like coal, oil, and gas, they release pollutants into the atmosphere. These pollutants include sulfur dioxide and nitrogen oxides, which can combine with water in the atmosphere to form sulfuric acid and nitric acid. These acids can fall to the earth in the form of precipitation, such as rain, snow, or fog, hence the term 'acid precipitation'. This process can have harmful impacts on the environment, including pollution of bodies of water and damage to vegetation.
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