Science, asked by SweetButAPsycho, 5 months ago

thanks for helping me Everyone
. why do we classify the elements?​

Answers

Answered by happybirthday37
0

Answer:

MARK ME BRALIEST

Elements can be classified as metals, metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.

EXERCISES

Metal or Nonmetal?

Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

uranium

bromine

strontium

neon

gold

americium

rhodium

sulfur

carbon

potassium

Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

cobalt

europium

iodine

indium

lithium

oxygen

cadmium

terbium

rhenium

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Identifying Elements

Using the periodic table, identify the lightest member of each of the following groups:

noble gases

alkaline earth metals

alkali metals

chalcogens

Using the periodic table, identify the heaviest member of each of the following groups:

alkali metals

chalcogens

noble gases

alkaline earth metals

Use the periodic table to give the name and symbol for each of the following elements:

the noble gas in the same period as germanium

the alkaline earth metal in the same period as selenium

the halogen in the same period as lithium

the chalcogen in the same period as cadmium

Use the periodic table to give the name and symbol for each of the following elements:

the halogen in the same period as the alkali metal with 11 protons

the alkaline earth metal in the same period with the neutral noble gas with 18 electrons

the noble gas in the same row as an isotope with 30 neutrons and 25 protons

the noble gas in the same period as gold

Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.

the alkali metal with 11 protons and a mass number of 23

the noble gas element with and 75 neutrons in its nucleus and 54 electrons in the neutral atom

the isotope with 33 protons and 40 neutrons in its nucleus

the alkaline earth metal with 88 electrons and 138 neutrons

Write a symbol for each of the following neutral isotopes. Include the atomic number and mass number for each.

the chalcogen with a mass number of 125

the halogen whose longest-lived isotope is radioactive

the noble gas, used in lighting, with 10 electrons and 10 neutrons

the lightest alkali metal with three neutrons

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Explanation:

Answered by kanividh38
3

Due to discovery of different elements, it was difficult to organize the information and properties of the elements, so there was a strong need to find some pattern in the properties of different elements so that they can be grouped together. That's why we classify elements.

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