Question

this element is directly below the element that has 49 protons in its nucleus. this element has 2 fewer protons than tennessee (ts). the atomic number of this element is 34. this element directly below the element that has an atomic number of 52. this element has 113 electrons surrounding its nucleus. this element has one less proton than arsenic (as). this element has 114 protons in its nucleus. the atomic number of this element is 31. this element is directly above the element whose atomic number is 87. this element has 49 protons in its nucleus. this element has 2 fewer electrons than bromine (br). this element is a noble gas with an 86 protons in its nucleus. this element has 50 electrons surrounding its nucleus.

Explanation:

Step1: Recall atomic - number and proton - electron relationship

The number of protons in an atom's nucleus is equal to its atomic number and, in a neutral atom, the number of electrons is equal to the number of protons.

Step2: Identify elements based on given proton/electron/atomic - number information

• Element with 49 protons: Indium (In), atomic number 49. The element directly below it has atomic number 49 + 18=67, which is Holmium (Ho).
• Tennessee (Ts) has atomic number 117. The element with 2 fewer protons has atomic number 117 - 2 = 115, which is Moscovium (Mc).
• Element with atomic number 34 is Selenium (Se).
• Element with atomic number 52 is Tellurium (Te). The element directly below it has atomic number 52+18 = 70, which is Ytterbium (Yb).
• Element with 113 electrons (and thus 113 protons) is Nihonium (Nh).
• Arsenic (As) has atomic number 33. The element with one - less proton has atomic number 33 - 1=32, which is Germanium (Ge).
• Element with 114 protons is Flerovium (Fl).
• Element with atomic number 31 is Gallium (Ga).
• Element with atomic number 87 is Francium (Fr). The element directly above it has atomic number 87 - 37 = 55, which is Cesium (Cs).
• Element with 49 protons is Indium (In).
• Bromine (Br) has atomic number 35. The element with 2 fewer electrons (and thus 2 fewer protons) has atomic number 35 - 2 = 33, which is Arsenic (As).
• Noble gas with 86 protons is Radon (Rn).
• Element with 50 electrons (and thus 50 protons) is Tin (Sn).

Answer:

Holmium (Ho), Moscovium (Mc), Selenium (Se), Ytterbium (Yb), Nihonium (Nh), Germanium (Ge), Flerovium (Fl), Gallium (Ga), Cesium (Cs), Indium (In), Arsenic (As), Radon (Rn), Tin (Sn)