The number of determine the identity of in element List the number of protons, n

Question

The number of determine the identity of in element List the number of protons, neutron, and electrons for 40 protons. 20 neutrons, and 20 electrons 40 protons. 20 neutrons, and 18 electrons 20 protons. 20 neutrons, and 18 electrons 20 protons. 20 neutrons, and 22 elections 60 protons. 20 neutrons, and 18 electrons Numbers 1-4 arc used to identify four different elements in the periodic table. Of these which element is most likely to have -2 charge when it forms an Ion? Based on the solubility roles. which of the following will occur w hen solutions ofznso_4(aq) and MgCl_2 arc mixed? ZnCl_2 will precipitate ZnSo_4 will precipitate. M_gSO_4 will precipitate M_gCl_2 will precipitate No precipitate will form. Based on common charges, which formula for an ionic compound is incorrect? Ca(OH)2 MgCl_3 Al_2O_3 KB_r Ba(NO,_3)2

Explanation / Answer

40. The number of neutrons plus proton determines the identity of element.

For a neutral atom, number of proton = number of electrons

Number of neutrons + protons = Mass number

Number of electrons = atomic number

The correct option is D

41. 40Ca2+

Atomic number of Ca = 20 (i.e., number of electrons or number of protons)

But due +2 charge, calcium ions two less electrons

Therefore number of electrons = 20 - 2 = 18

Mass number = No. of proton + no. of neutrons = 40

No. of protons = atomic number = 20

Therefore number of neutrons = 40 - 20 = 20

Correct option is C

42. Element 3 has most likely to have -2 charge on formation of ion.

Valence shell electronic configuration: ns2np4

Therefore this element will accept 2 electrons to complete its octet, therefore will carry -2 charge.

Correct option: C

43. The correct option is E. No precipitate will form

Both ZnCl2 and MgSO4 formed in the reaction remains soluble.

Q. 44. The correct option is C). MgCl3

Mg being member of group 2 forms Mg2+ ions only, therefore the correct formula will be MgCl2

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