Atoms Review

Front

Which of the following best describes an electron?

• it has a positive charge smaller than a proton
• it has no charge smaller than a proton
• it has a negative charge smaller than a proton
• it has a negative charge same size as proton

Back

it has a negative charge smaller than a proton

Front

Atomic number of Krypton is 36 and atomic mass is 84. Number of particles inside and outside the nucleus?

Back

inside 84 outside 36

Front

Location and charge of electrons in an atom.

Back

negative and outside the nucleus

Front

What types of particles are found outside the nucleus of an atom?

Back

negative particles only

Front

Which part of the atom shows how the atom will react to other atoms, or its reactivity? Options: W, X, Y, Z

Back

Z

Front

Which element on the periodic table is this an example of? The black circles represent protons. Options: carbon, helium, boron, oxygen.

Back

boron

Front

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the nucleus?

Back

+25

Front

How many protons, neutrons, and electrons are there in an atom of Hafnium, Hf, if the mass is 178?

Back

72 protons 106 neutrons 72 electrons

Front

What is the mass of potassium if it has 20 neutrons?

Back

39

Front

Which statement would accurately describe an atom of tin? Options: 50 protons, 118 neutrons, 137 protons, 85 electrons

Back

50 protons