Question

m
clue
this element is an alkali metal with 55 protons.
this element is a noble gas with 86 protons in its nucleus.
the atomic number of this element is 49.
this element has 2 fewer electrons than bromine (br).
this element has one more electron than indium (in).
this element is directly below the element that has 34 protons in its nucleus
this newly synthesized element has 118 protons.
this element has 51 electrons surrounding its nucleus.
this element has 6 electrons surrounding its nucleus.
this element directly below the element whose atomic number is 81.
this element has 81 electrons surrounding its nucleus.
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element
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Explanation:

Step1: Recall element - proton relationship

The number of protons is equal to the atomic number. For an alkali - metal with 55 protons, looking at the periodic table, the element is Cesium (Cs).

Step2: Identify noble gas

A noble gas with 86 protons is Radon (Rn).

Step3: Find element by atomic number

An element with atomic number 49 is Indium (In).

Step4: Determine element relative to Bromine

Bromine (Br) has 35 electrons. An element with 2 fewer electrons has 33 electrons, which is Arsenic (As).

Step5: Find element relative to Indium

Indium (In) has 49 electrons. An element with one more electron has 50 electrons, which is Tin (Sn).

Step6: Locate element below another

The element with 34 protons is Selenium (Se). The element directly below it is Tellurium (Te).

Step7: Identify newly - synthesized element

An element with 118 protons is Oganesson (Og).

Step8: Determine element by electron number

An element with 51 electrons is Antimony (Sb).

Step9: Find element with 6 electrons

An element with 6 electrons is Carbon (C).

Step10: Locate element below another

The element with atomic number 81 is Thallium (Tl). The element directly below it is Lead (Pb).

Step11: Determine element by electron number

An element with 81 electrons is Thallium (Tl).

Answer:

Cesium (Cs), Radon (Rn), Indium (In), Arsenic (As), Tin (Sn), Tellurium (Te), Oganesson (Og), Antimony (Sb), Carbon (C), Lead (Pb), Thallium (Tl)