2. Atoms & Elements

Which part of the atom is primarily responsible for chemical reactions between atoms?

Why is a complete atom considered to be electrically neutral?

Which parts of an atom contribute most to its mass?

Which fundamental particle did J.J. Thomson discover through his cathode ray experiments?

How many regions of high electron density (rheds) surround the central aluminum atom in AlBr3?

Where is the electron located in an atom?

How many electrons are present in a neutral atom of sodium (Na)?

Where are protons located within an atom?

Which of the following best describes the difference between an atom and a molecule?

How many protons are present in a neutral atom of phosphorus?

Titanium has an atomic number of 22 and its most abundant isotope has a mass number of 48. How many neutrons are present in an atom of this isotope of titanium?

Which term is used to describe the measure of the amount of matter in an object?

Where are the protons located in an atom?

What is the charge of the nucleus of every atom?

How many protons are present in the nucleus of a lithium (Li) atom?