Chemistry Quiz

In a chemistry class, David learns that the atomic number of an atom is defined as its _____.

• Number of neutrons

• Number of electrons

• Number of protons

During a science fair, Samuel presents a model of an atom and explains that this nuclear symbol for fluorine indicates an atom that contains _____.

• 9 protons and 19 neutrons

• 19 protons and 9 neutrons

• 9 protons and 10 neutrons

Tags

NGSS.MS-PS1-1

In a science fair project, Isla demonstrated that the electron was discovered by _____.

• Thomson

• Millikan

• Rutherford

A neutral atom always contains an _____.

• Equal number of protons and neutrons

• Equal number of protons and electrons

• Unequal number of protons and neutrons

During a science fair, Ethan built a model of an atom. Which of the following particles did he place outside the nucleus of his model?

• Protons

• Neutrons

• Electrons

Imagine Oliver and Lily are building a model of an atom for their science project. They are trying to figure out its mass number. The mass number of their atom model is defined as _____.

• Total number of protons and neutrons

• Number of protons

• Total number of protons and electrons

In a chemistry class, Grace is asked to determine an element's identity. She knows that this can be done by its _____.

• Atomic number

• Number of neutrons

• Atomic mass

During a science fair, Jackson presents a model explaining atomic theory. Which of the following points, according to Dalton's atomic theory, did he incorrectly attribute to the structure of an atom?

• All atoms of the same element are the same

• Atoms combine in small, whole number ratios to form compounds.

• Atoms are made of protons, neutrons and electrons

During a science fair, Anika presented an experiment similar to the gold foil experiment to demonstrate that an atom contains a dense positively charged core with a lot of empty space. Which scientist originally conducted this experiment?

• Bohr

• Thomson

• Rutherford

Tags

NGSS.HS-PS1-8

During a science fair, Evelyn and Abigail compared the mass numbers of different atoms in their project. Which two atoms have the same mass number?

• Atoms 1 and 2

• Atoms 2 and 4

• Atoms 1 and 4