methane is a flammable compound made of carbon and hydrogen atoms. how could you seperate the carbon and hydrogen in methane

Answer:

C. The halogens

Explanation:

The word that best fits is frequency.  Thus,the sentence is,the frequency of a wave is a measure of the amount of energy it carries.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

There is a direct relationship between frequency and energy of a wave. The constant of proportionality is h, Planck's constant. So, Energy = h  frequency. So, the answer is frequency.

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Answer:

The resistance would be 64.10 ohms.

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Length a physical quantity will be measured in meters, therefore option (c) is correct.

What do you mean by physical quantity ?

A physical quantity can be defined as the characteristic property of a system that is generally quantified in terms of measurement.

Length , a physical quantity -

The physical quantity associated with length can be written as x meter, where x is the numerical value, and the meter specifies the unit .

Meter is represented by m. It is the fundamental unit of length.

Initially, One meter was defined as a quantity that is 1650763.73 times the wavelength of the light emitted in a vacuum .

Length a physical quantity will be measured in meters ,hence option (c) is correct.

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Answer:

Column 1. They have one valence electron

Column 2. They have 2 valence electrons

Transition metal column. Variable oxidation states

Column 3–7. Valence electron ranges from 3 to 7 electrons

Column 8. Completely filled i.e no valence electron

Explanation:

Final answer:

Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.

Explanation:

We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.

• Column 1: These elements, also known as alkali metals, have a single valence electron in their outermost shell. These elements are highly reactive due to their tendency to lose this electron and achieve a stable configuration.
• Column 2: These are the alkaline earth metals, which have two valence electrons. They are less reactive than alkali metals but will still readily lose their valence electrons to achieve stability.
• Transition Metal Columns: These contain transition metals which typically have one or two valence electrons, although this can be more complex due to the filling of inner d orbitals.
• Columns 3–7: Elements in these groups have 3 to 7 valence electrons respectively. Many form covalent bonds by sharing their valence electrons with other atoms.
• Column 8: Known as the Noble Gases, these elements possess a stable full set of 8 valence electrons (except for Helium which has 2). They are very unreactive due to their stable electronic configuration.

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