the comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustr
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The question is incomplete, here is the complete question:
Classify each element. Note that another term for main group is representative, another term for semi-metal is metalloid, and the inner transition metals are also called the lanthanide and actinide series.
Hf, Am, In, Ta, As, Se, Rn
<u>Answer:</u>
Hafnium and tantalum are transition elements.
Americium is a inner transition element.
Indium, Selenium and Radon are main group elements.
Arsenic is a metalloid.
<u>Explanation:</u>
Main group elements are the elements which belong to s block and p block. They are also known as representative elements.
S-block elements are defined as the elements whose last electron enters s-sub shell. The general electronic configuration of these elements is
P-block elements are defined as the elements whose last electron enters p-sub shell. The general electronic configuration of these elements is
Metalloids are defined as the elements which show intermediate properties between metals and non-metals. There are 7 metalloids in the periodic table. They are: Boron, Silicon, germanium, Arsenic, Antimony, Tellurium and Polonium.
Transition elements are known as d-block elements. D block elements are defined as the elements whose last electron enters d sub shell. The general electronic configuration of these elements is
Inner transition elements are known as (f block) elements. (F block) elements are defined as the elements whose last electron enters (f subshell). The general electronic configuration of these elements is . They are also known as lanthanide and actinide series.
For the given elements:
- <u>Option 1:</u> Hf
Hafnium is the 72nd element of the periodic table having electronic configuration of
As, the last electron is entering the d subshell, it is a transition element.
- <u>Option 2:</u> Am
Americium is the 95th element of the periodic table having electronic configuration of
As, the last electron is entering the (f subshell), it is a inner transition element.
- <u>Option 3:</u> In
Indium is the 49th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.
- <u>Option 4:</u> Ta
Tantalum is the 73rd element of the periodic table having electronic configuration of
As, the last electron is entering the d subshell, it is a transition element.
- <u>Option 5:</u> As
Arsenic is the 33rd element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element. It shows an intermediate property of metal and non-metal. Thus, it is a metalloid.
- <u>Option 6:</u> Se
Selenium is the 34th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.
- <u>Option 7:</u> Rn
Radon is the 86th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.
Answer: The statement it is a weak acid is true for the substance.
Explanation:
An acid that dissociates completely when dissolved in water to give hydrogen or hydronium
ions is called a strong acid.
For example, HCl is a strong acid.
An acid that dissociates partially or weakly when dissolved in water to given hydrogen or hydronium ions is called a weak acid.
For example, is a weak acid.
A strong base is a base which when dissolved in water then it dissociates completely to give hydroxide ions.
For example, NaOH is a strong acid.
A weak base is a base which when dissolved in water then it dissociates partially or weakly to give hydroxide ions.
For example, is a weak base.
Hence, in an aqueous solution where 42% of a substance dissociates to release hydronium ions shows that the dissociation is less than 50%. This means that substance is dissociating weakly so, it is a weak acid.
Thus, we can conclude that the statement it is a weak acid is true for the substance.