Structure of the atom

Which of the following subatomic particle determines the identity of an element?

• Neutron

• Proton

• Electron

An element with a mass number of 10 and an atomic number of 6 has how many protons?

• 5
• 8
• 6
• 10

Tags

NGSS.MS-PS1-1

What is the atomic number of the atom pictured? 

• 11
• 12
• 22
• 23

Tags

NGSS.HS-PS1-1

How many protons, electrons and neutrons does an neutral atom of Calcium have?  Its atomic number is 20 and the mass number is 40.

• 20 protons, 18 electrons and 40 neutrons
• 20 protons, 20 electrons and 20 neutrons
• 40 protons, 40 electrons and 20 neutrons
• 20 protons, 18 electrons and 20 neutrons

Tags

NGSS.MS-PS1-1

Ag-110 and Ag-112 are two forms of silver with different mass, so they are:

• compounds
• isotopes
• orbitals
• neutrons

Tags

NGSS.HS-PS1-8

Neutrons have almost exactly the same mass as

• electrons.

• positrons.

• protons.

• quarks.

Tags

NGSS.HS-PS1-8

Which particles are not inside the nucleus?

• Electrons

• Neutrons

• Protons

What is the lightest subatomic particle?

• atom

• electron

• proton

• neutron

How is Proton different from electron?

• An electron is much heavier than a proton.

• An electron carries more charge than a proton.

• A proton can be easily removed from the atom, but not an electron.

• A proton is positively charged, whereas an electron is negatively charged

Rutherford conducted an experiment to study the structure of atom. He passed positively charged alpha particles through a thin gold foil. He studied the angle of deflection of the alpha particles. He noticed that most of the alpha particles passed through the gold foil without any deflection. What can be concluded from the observation?

• Most of the space in an atom is empty.

• Atoms have electrons, protons, and neutrons.

• The nucleus of the atom is situated at the center.

• Atoms do not have positively charged particles.