Structure of At...

An isotope of helium is represented by the symbol $$_{ 2 }^{ 3 }{ He }$$. How many protons, neutrons and electrons are there in an atom of the isotope?

What is the ratio of the number of neutrons present in potassium and magnesium atoms with mass number $$39$$ and $$24$$ respectively?

Analyze the Photoelectron Spectra graph.
What is the electron configuration for this element?

Which of the following statement in relation to the calcium atom is incorrect?

Analyze the mass spectrum graph.

A student created the following Beer's Law Plot by sampling different concentrations of Copper (II) Sulfate solutions and measuring their absorbance at $$600\ nm$$ on a spectrophotometer.
What does the slope represent?

Analyze the Photoelectron Spectra.
What is the identity of the element?

Statement I: The $$5s$$ orbital is filled after the $$4d$$ orbital
BECAUSE
Statement II: The $$5s$$ orbital has a lower energy than the $$4d$$ orbital

Scientists previously thought an atom looked like plum pudding. In this model, it was assumed that protons and electrons were distributed throughout the atom almost randomly. Which of the following contributions DISPROVED the Plum Pudding Model?

Which experiment was developed on the plum pudding model of the atom?