Question

this element is directly below the element that has 49 protons in its nucleus. this element has 2 fewer protons than tennessine (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 atomic number of an element is equal to the number of protons in its nucleus. In a neutral atom, the number of electrons is equal to the number of protons.

Step2: Analyze each statement

• "This element has 49 protons in its nucleus": Indium (In) has atomic number 49.
• "This element has 2 fewer protons than Tennessine (Ts)": Ts has atomic number 117, so the element has 115 protons (Mc - Moscovium).
• "The atomic number of this element is 34": Selenium (Se).
• "This element is directly below the element that has an atomic number of 52": Tellurium (Te) has atomic number 52, and the element below it is Polonium (Po).
• "This element has 113 electrons surrounding its nucleus": In a neutral atom, number of electrons = number of protons, so the element has atomic number 113 (Nh - Nihonium).
• "This element has one less proton than Arsenic (As)": As has atomic number 33, so the element has atomic number 32 (Ge - Germanium).
• "This element has 114 protons in its nucleus": Flerovium (Fl).
• "The atomic number of this element is 31": Gallium (Ga).
• "This element is directly above the element whose atomic number is 87": Francium (Fr) has atomic number 87, and the element above it is Cesium (Cs).
• "This element has 49 protons in its nucleus": Indium (In) again.
• "This element has 2 fewer electrons than Bromine (Br)": Br has 35 electrons, so the element has 33 electrons and 33 protons (As - Arsenic).
• "This element is a noble gas with 86 protons in its nucleus": Radon (Rn).
• "This element has 50 electrons surrounding its nucleus": In a neutral atom, it has 50 protons, so the element is Tin (Sn).

Answer:

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