Chemistry, 22.10.2019 08:00 firdausmohammed80

Which material would have the weakest attraction between its particles? a) salt, which is an ionic compound with forces between ions. b) water, which is a polar covalent molecule with hydrogen bonding. eliminate c) nitrogen gas, which is a nonpolar covalent molecule with dispersion forces. d) a diamond, which is a network covalent molecule with bonds between many atoms.

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Answer from: chammusa2

Nitrogen gas, which is a nonpolar covalent molecule with dispersion forces.

Explanation:

Nitrogen gas is a diatomic gas composed of nonpolar covalent bonds. This implies that the gas particles are held together strictly by weak van der Waals forces.

Van der Waals forces represents the weakest level of intermolecular interaction. They are mostly found in nonpolar substances especially gases. Hence, nitrogen gas will exhibit the weakest degree of inter-particle attraction among all the options listed.

Answer from: Quest

the atomic mass is the bottom number on the element.

-steel jelly

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.

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