Question

in which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
cs, 55 protons, 132.9 electrons
f, 19 protons, 19 electrons
in, 49 protons, 49 electrons
zn, 30 protons, 60 electrons
question 4
2.5 pts
what is the element with the highest electronegativity value?
helium
calcium
fluorine
cesium

Explanation:

Step1: Analyze the first option

• For a neutral atom, the number of electrons should equal the number of protons.
• The number of electrons cannot be a non - integer (132.9 is not a valid number of electrons for a neutral atom). So, the option “Cs, 55 protons, 132.9 electrons” is incorrect.

Step2: Analyze the second option

• The atomic number of fluorine (F) is 9. So, it should have 9 protons (not 19). So, the option “F, 19 protons, 19 electrons” is incorrect.

Step3: Analyze the third option

• Indium (In) has an atomic number of 49. For a neutral In atom, the number of protons = number of electrons = 49. So, the option “In, 49 protons, 49 electrons” is correct.

Step4: Analyze the fourth option

• For a neutral atom, the number of electrons should equal the number of protons.
• If Zn has 30 protons, it should have 30 electrons (not 60). So, the option “Zn, 30 protons, 60 electrons” is incorrect.

Step5: Analyze the electronegativity question

• Helium (He) is a noble gas. Noble gases have very low electronegativity (they have a full valence shell and do not tend to gain electrons easily).
• Calcium (Ca) is a metal. Metals generally have low electronegativity as they tend to lose electrons.
• Fluorine (F) has the highest electronegativity among all elements. It has a strong tendency to attract electrons due to its small atomic size and high nuclear charge.
• Cesium (Cs) is a metal and has a very low electronegativity as it readily loses its outermost electron.

Answer:

• For the first question: In, 49 protons, 49 electrons.
• For the second question: fluorine.