Mastery Flashcard Fall 2024

Front

What is the Plum-Pudding model of the atom?

Back

A model proposed by J.J. Thomson suggesting that atoms are composed of a 'pudding' of positive charge with negatively charged electrons embedded within it.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

It demonstrated that atoms have a small, dense nucleus that contains most of the atom's mass, and that electrons orbit this nucleus.

Front

What is the electron configuration for Magnesium?

Back

1s² 2s² 2p⁶ 3s².

Front

What happens to an atom if a proton is added or removed?

Back

It becomes a different element.

Front

What is the name of the experiment that led to the discovery of the electron?

Back

Cathode Ray Tube (CRT) Experiment.

Front

How many moles are in 20 grams of Calcium (Ca)?

Back

0.50 mol.

Front

What is the significance of the atomic number?

Back

The atomic number defines the number of protons in an atom and determines the element's identity.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the formula to calculate moles from grams?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the role of electrons in chemical bonding?

Back

Electrons, particularly valence electrons, are involved in forming bonds between atoms, determining the chemical properties of elements.