512 Atomic Theory & Structure

How many electrons does a radium ion with a charge of 2+ have?

How many valence electrons does Calcium have?

Which scientist determined electrons exists in orbits or energy levels of fixed energy?

What does the "35" represent in this isotopic notation?

Which subatomic particle(s) make up the nucleus of an atom?

An ____ is a region of space around the nucleus where an electron is likely to be found.

The atomic number of an element is the total number of which particles in the nucleus, ALWAYS?

An atom in the ground state has 7 valence electrons. This could be an atom of which element?

The quantum-mechanical model of the atom

How do you calculate the number of neutrons in the nucleus of an atom?

How many neutrons does an atom with an mass number of 9 and an atomic number of 5 contain?

Which scientist's gold foil experiment helped determine the structure of the atom?

Isotopes always have the same number of...

How many total electrons does Neon have?

Which subatomic particle is negative?

What is the smallest particle that retains the properties of an element?

What does the atomic mass of an element depend on?

How many protons does carbon have?

Element Y has 3 isotopes 88% at 111 amu, 8% at 112 amu, and 4% at 113 amu. Calc atomic mass.

Which of the following represents a ground state configuration for K?

How many valence electrons does phosphorus (P) have?

Who was the man who lived 460-370 B.C. and was the first to suggest the idea of atoms?

With an atomic number of 64, how many protons & electrons in a neutral atom of this element?

Element X has an average atomic mass of 23.9 Which isotope, X-23 or X-24, is most abundant?

An electron is added to an atom of Cl. The atom becomes

Which subatomic particle is neutral?

Using the periodic table, determine the number of neutrons in Cobalt-59

An e- in a Na atom gains enough energy to move from the 2nd to 3rd shell. The atom becomes

What unit is used to measure weighted average atomic mass?

Which of the following is NOT part of Dalton's theory?

What is the total number of protons and neutrons in the nucleus?

How many energy levels have electrons in them for an atom of Na?

Which of the following statements is NOT true?

Atoms with the same number of protons, but different neutrons are called ____?

An element has a mass number of 80 and has 45 neutrons, what element is it?

Proposed the theory that all matter is made up of individual particles called atoms

Lithium produces a characteristics red color in a flame when electrons in excited lithium atoms

If a neutral aluminum atom loses three electrons, what charge will its ion have?

An atom has 20 protons, 30 neutrons, and 20 electrons. What is its mass number?

Bohr's model focused on the electrons. What was the name of this model?

Which subatomic particle is positive?

When all the electrons in an atom have the lowest possible energies, it's in its

What is the atomic mass of an element?

Which electrons configuration represents the electrons of neon in an excited state?

How many electrons can the third energy level hold, maximum?

Bright Line Spectra gave Bohr evidence that energy is absorbed and emitted in

Since each atom must be neutral the atomic number also tells us the number of ____ in an atom.

Which 2 subatomic particles have relatively the same mass?

Which scientist discovered the electron?

What is the electrons configuration for a Be²⁺ ion?