Chemistry, 06.11.2020 20:50 Sumaiyajr2567

Which of these statements describes a characteristic of all mechanical waves? a
they are transverse waves
b
they are electromagnetic waves
c
they travel through a medium
d
they travel through empty space

Answers: 2

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Answer from: angie249

Explanation:

Mechanical waves require a medium to travel.

Answer from: francisco42002

c. they travel through medium

Explanation:

c. because a mechanical wave is a wave that cannot transmit its energy through a vacuum. Mechanical waves need a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.

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

it’s previous models because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter

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Which of these statements describes a characteristic of all mechanical waves? a
they are tran...