atomic and nuclear theory and the periodic table

Studying Science

What particle did James Chadwick discover?

Neutrons

What Greek came up with the idea of the atom, which he called "atomos", or "uncuttable"?

Democritus

An atom's nucleus contains _______ and _______.

Protons and Neutrons.

If an atom is neutral (no net charge) it is because it has the same number of _____ and _______.

protons and electrons.

Neutrons have ___________ charge and are found in the __________.

no electric charge/ neutral ; nucleus

Which particle has a mass most similar to the proton?

Neutron

Electrons have a ______________ charge and are found in the __________.

negative ; electron cloud

Bohr discovered that electrons have discrete energy levels and proposed the orbit the nucleus like planets. t/f

true

The symbols for the different particles in an atom include the first letter of their name and their charge as an exponenet. Pick a correct symbol.

For example, the symbol for a proton is ( p^+ ) and for an electron is ( e^- ).

True or False: Electrons have NO mass.

False; electrons have a very small mass.

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of _______.

13 atomic mass units (amu)

The number of protons in an atom is known as the ____________.

atomic number.

What particle did JJ Thomson discover?

The electron, a negatively charged subatomic particle.

What letter do we give the energy level that is also called the 2nd energy level and can hold up to 8 electrons?

The letter "L".

Which of the following is NOT a name of one of the atomic models?

Quantum Mechanical Model

Plum Pudding Model

Planetary Model

Schrodinger's Cat Model

The Schrodinger's Cat Model is not an atomic model but rather a thought experiment in quantum mechanics.

Which of the following is NOT part of Dalton's Atomic Theory?

Atoms cannot be created nor destroyed during a chemical change

All elements are made of atoms that cannot be divided

All atoms of the same element are exactly alike

Atoms of different elements are exactly alike

Atoms of different elements are exactly alike is not part of Dalton's Atomic Theory.

An atom has 34 neutrons, 32 electrons, and 32 protons. What is its atomic number?

The atomic number is 32, which represents the number of protons in an atom.

One part of Dalton's Atomic Theory states that matter cannot be created nor destroyed during a chemical change. t/f

True, this principle emphasizes the conservation of mass. It asserts that in any chemical reaction, the total mass of reactants equals the total mass of products.

To get the mass number of an element, add the number of _______ to the number of ________.

neutrons, protons

Bohr discovered that electrons have discrete energy levels and proposed the orbit the nucleus like planets. t/f

True, this model explains how electrons exist in defined orbits around the nucleus, similar to planets orbiting the sun.

What determines the identity of  an element (atom)?

The number of protons in its nucleus, also known as the atomic number.

What caused the alpha particles to be deflected during the Gold Foil Experiment?

The positive charge of the atomic nucleus.