Considering only ions with charges of +1. +2. -1 and -2. or neutral atoms, give

Question

Considering only ions with charges of +1. +2. -1 and -2. or neutral atoms, give the symbols for 4 species that are is electronic with the sulfide ion S2- considering only ions with charges of +1 +2. -1 and -2. or neutral atoms, give the symbols for 4 species that are is electronic with Ar. Which of the following describes the element Li. Choose all that apply. is found in nature only combined with other elements reacts vigorously with alkali metals to form salts forms a basic solution in water is very reactive as a metal is one of the group of the least reactive elements consists of diatomic molecules in elemental form Which of the following describes the element Cs Choose all that apply. forms a basic solution in water is one of the group of the least reactive elements is found in nature only combined with other elements consists of diatomic molecules in elemental form reacts vigorously with alkali metals to form salts is very reactive as a metal. Which of the following describes the element Cl? Choose all that apply. reacts vigorously with alkali metals to form salts forms a basic solution in water is one of the group of the least reactive elements consists of diatomic molecules in elemental form is very reactive as a metal belongs to a group consist entirely of gases

Explanation / Answer

1) Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms Cl- , Ar, K+, Ca2+ are iso electronic with sulfide ion

Isoelectronic means having the same electronic configuration.

The element S (atomic number 16) has the electronic configuration 1s22s22p63s23p4.

The S2- ion has 2 more electron(s) with an electronic configuration of 1s22s22p63s23p6.

The electronic configuration of the noble gas Ar (atomic number 18) is also 1s22s22p63s23p6. Therefore the S2- ion and the noble gas Ar are isoelectronic.

Any species that is isoelectronic with S2- and Ar must have the same electronic configuration. The other possibilities are summarized in the following table and are the anion Cl-, and the cations K+ and Ca2+.

2) K+ , Cl- , P3- , Ca2+ Notice that all of these ions have 18 electrons and the same electron configuration as the noble gas argon.

1s22s22p63s23p6

Substances with the same number of electrons and the same electron configuration are isoelectronic

3) Lithium in nature Pure lithium metal is never found in nature. Lithium is much too reactive for this. Instead lithium combines with other elements to form many naturalcompounds

Lithium metals reacts slowly with water to form a colourless solution of basic lithiumhydroxide (LiOH) and hydrogen gas (H2)

Lithium is part of the Group 1 Alkali Metals, which are highly reactive and are never found in their pure form in nature

so therefore 1,3,4 options are correct.

4) Caesium (cesium in USA) metal reacts rapidly with water to form a colourless solution of caesium hydroxide (CsOH) and hydrogen gas Caesium (cesium in USA) metal reacts rapidly with water to form a colourless solution of caesium hydroxide (CsOH) and hydrogen gas

caesium is a naturally occurring element found combined with other elements in rocks,SOIL,sand....

caseium is a very reactive

therefore 1,3,6 options are correct

4)All the alkali metals react vigorously with halogens to produce salts.

Cl consistsn of diatomic molecules in elemental form Cl2

Cl is more reactive as metal

therefore 1, 4 , 5 options are correct

element atomic no. electron config element ion or element electron config ion or element S 16 1s22s22p63s23p4 S2- 1s22s22p63s23p6 Cl 17 1s22s22p63s23p5 Cl- 1s22s22p63s23p6 Ar 18 1s22s22p63s23p6 Ar 1s22s22p63s23p6 K 19 1s22s22p63s23p64s1 K+ 1s22s22p63s23p6 Ca 20 1s22s22p63s23p64s2 Ca2+ 1s22s22p63s23p6

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