Mastery Flashcard Fall 2024

Front

What is the noble gas electron configuration for a Sulfur atom?

Back

[Ne] 3s² 3p⁴

Front

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

Back

0.50 mol

Front

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

Back

increases, decreases

Front

What is the atomic number of the element with atomic number 17?

Back

17

Front

What is the average mass of an element with the following isotopes: 24.1% at 75.23 amu, 48.7% at 74.61 amu, and 27.2% at 75.20 amu?

Back

74.92 amu

Front

Define atomic number.

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the formula to calculate moles from mass?

Back

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

Front

What is the significance of the periodic table in chemistry?

Back

It organizes elements based on their atomic number, electron configurations, and recurring chemical properties.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the definition of isotopes?

Back

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