2. Atoms & Elements

Which of the following best describes a species with 7 protons, 7 neutrons, and 10 electrons?

Which is a characteristic of the part of the atom marked 'a', assuming 'a' refers to the nucleus?

Which of the following best describes the difference between atomic number and mass number?

What does the atomic number of an element indicate?

Which of the following best describes the approximate size of a typical atom?

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

Which of the following best describes the overall charge of an atom's nucleus?

In an atom, where is a neutron located?

Who was the first person to suggest the existence of atoms?

During hydrogen fusion in stars, how many protons must combine to form a helium-4 nucleus?

Which of the following statements about electrons is NOT true?

Which of the following elements has the highest electronegativity, meaning it pulls electrons towards itself most strongly?

How many protons are present in the nucleus of a single atom of 56 26 Fe?

Which of the following is the smallest possible piece of a pure substance that retains its chemical properties?

Which of the following best describes the relative mass of an electron compared to a proton?