Semester 1 Practice Assessment

Front

What is the Bohr model of an atom?

Back

The Bohr model is a representation of the atom that depicts electrons orbiting the nucleus in defined paths or energy levels. It was proposed by Niels Bohr in 1913.

Front

What are noble gases?

Back

Noble gases are a group of chemical elements that are odorless, colorless, monatomic gases with very low chemical reactivity. They include helium, neon, argon, krypton, xenon, and radon.

Front

Which elements have similar chemical properties?

Back

Elements in the same group of the periodic table have similar chemical properties. For example, potassium (K) and sodium (Na) are both alkali metals and share similar characteristics.

Front

What is the atomic structure of a neon atom?

Back

A neon (Ne) atom contains 10 protons, 10 electrons, and typically 10 neutrons. The electrons are arranged in energy levels around the nucleus.

Front

How do you calculate the mass number of an atom?

Back

The mass number of an atom is calculated by adding the number of protons and neutrons in the nucleus. For example, a potassium atom with 19 protons and 20 neutrons has a mass number of 39.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties, allowing for the prediction of element behavior.

Front

What are isotopes?

Back

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

Front

What is the electron configuration of potassium (K)?

Back

The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹, indicating it has one electron in its outermost shell.

Front

What are the characteristics of alkali metals?

Back

Alkali metals are highly reactive, have one electron in their outermost shell, and are soft, shiny, and good conductors of electricity.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus by offsetting the repulsive forces between positively charged protons.