Structure of Atom Class 9 CBSE

The subatomic particle that determines the identity of an element.

• neutron
• proton
• electron
• outer shell

What is the mass number and name of an element with 8 protons and 8 neutrons?

• 16 - Carbon
• 16 - Oxygen
• 24 - Oxygen
• 8 - Neon

Tags

NGSS.MS-PS1-1

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.MS-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

 What is the mass number of this element?

• 5
• 27
• 32
• 59

Tags

NGSS.MS-PS1-1

Thompson was the first to discover a subatomic particle - the electron. What are the others?

• neutrons & positrons

• protons & neutrons

• positrons & quarks

• protons & positrons

Tags

NGSS.MS-PS1-1

Rutherford concluded that the amount of positive charge varies

• with the amount of electrons in the nucleus.

• as the the amount of isotopes varies.

• with the amount of neutrons in the nucleus.

• with different elements.

Tags

NGSS.HS-PS1-8

The word "electron" comes from the ancient Greek word meaning

• amber.

• to change or become flexible.

• elektron.

• electricity.

Tags

NGSS.HS-PS1-1