Chemistry, 14.07.2019 01:40 GreenHerbz206

Match the element with its description. match term definition potassium a) great conductor of heat and electricity barium b) malleable and highly reactive boron c) has properties of both metals and nonmetals neon d) nonreactive gas

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Barium - A) Great conductor of heat and electricity Potassium - B) Malleable and highly reactive Boron - C) Has properties of both metals and nonmetals Neon - D) Nonreactive gas Let's look at each element and it's place on the periodic chart to see what matches. Potassium - This is on the far left column for alkali metals. This means it's highly reactive and since it's a metal, it's both malleable and conductive. Looking at the available options, "B) Malleable and highly reactive" is the best choice. Barium - This element is in the second column from the left, so it's a fairly reactive metal, but not nearly as reactive as Potassium above. So "A) Great conductor of heat and electricity" is the best choice here, although I wouldn't call it "great". The resistivity of barium is about 20 times larger than copper. Boron - This element is about in the middle of the periodic chart, so it does have the properties of both metals and nonmetals. So "C) Has properties of both metals and nonmetals" is the best choice. Neon - This is in the far right column for noble gasses. Very non-reactive. So "D) Nonreactive gas" is the best choice.

Answer from: haileyjones732

Great conductor of heat and electricity: Barium

Malleable and highly reactive: Potassium

Has properties of both metals and nonmetals: Boron

Nonreactive gas: Neon

The group of elements that has the ability to conduct electricity and heat is Group I or II. Barium belongs to Group II and has been able to conduct electricity and heat.The group I elements are malleable and highly reactive. Potassium belongs to group I metal and is highly malleable and reactive.The noble gases have the properties of both metal and non-metal. The Boron has properties of both.The noble gases are non-reactive gases. Thus neon has been the non-reactive gas.

For more information about the elements of the periodic table, refer to the link:

link

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

the answer is 0.8m.

by: nicholas

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Match the element with its description. match term definition potassium a) great conductor of heat a...