STRUCTURE OF ATOM

WHO DISCOVERED ELECTRONS

• J.J.THOMSON

• E.GOLDSTEIN

• RUTHERFORD

• CHADWIK

WHO DISCOVERED PROTONS?

• E.GOLDSTEIN

• J.J.THOMSON

• RUTHERFORD

• CHADWIK

ATOM HAS A POSITIVELY CHARGED NUCLEUS

THIS WAS PROPOSED BY SCIENTIST:

• J.J.THOMSON

• E.GOLDSTEIN

• RUTHERFORD

• NEILS BOHR

ELECTRONS REVOLVE IN DISCRETE ENERGY SHELLS

THIS WAS PROPOSED BY

• NEIL BOHR

• ANTOINNE LAVOISIER

• ROBERT BOYLE

• RUTHERFORD

K SHELL-2, L SHELL- 7, M SHELL-2 IS ELECTRONIC CONFIGURATION OF:

• HYDROGEN

• SODIUM

• MAGNESIUM

• NONE

Tags

NGSS.HS-PS1-1

AN ATOM HAS MASS NUMBER 37 AND ATOMIC NO 17.FIND THE NO OF PROTONS

• 21

• 22

• 17

• 20

Tags

NGSS.MS-PS1-1

WHICH OF THE FOLLOWING IS RESPONSIBLE FOR MASS OF AN ATOM

• NO OF PROTONS

• NO OF ELECTRONS

• NO OF PROTONS AND NEUTRONS

• NO OF NEUTRONS

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-8

FIND OUT THE ATOMIC NO OF ELEMENT IF ITS BOTH K AND L SHELLS ARE COMPLETELY FULL:

• 11

• 20

• 12

• 10

Tags

NGSS.HS-PS1-1

WHICH OF THE FOLLOWING DECIDE THE CHEMICAL PROPERTIES OF ELEMENTS?

• NO OF PROTONS

• NO OF VALENCE ELECTRONS

• NO OF ELECTRONS IN L SHELL

• NO OF NEUTRONS

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

WHAT HAPPENS TO THE ATOMIC NO DURING A CHEMICAL REACTION?

• IT INCREASES

• IT DECREASES

• REMAINS SAME

• CHANGES ALTERNATIVELY

Tags

NGSS.HS-PS1-7