Atoms Review

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

Tags

NGSS.MS-PS2-3

If the atomic number of Krypton is 36 and the atomic mass is 84. Then which choice show the correct number of particles inside and outside the nucleus of the atom?

• inside 36 outside 36

• inside 36 outside 84

• inside 84 outside 36

• inside 84 outside 84

Tags

NGSS.MS-PS1-1

Which answer choice correctly describes the location and charge of electrons in an atom.

• negative and inside the nucleus

• negative and outside the nucleus

• postitive and inside the nucleus

• no charge and inside the nucleus

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

• negative particles only

• positive particles only

• neutral particles only

• positive and neutral particles only

In the atom above which part of the atom show how the atom will react to other atoms, or its reactivity?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS1-1

Which element on the periodic table is this an example of? The black cicles represent protons.

• carbon

• helium

• boron

• oxygen

Tags

NGSS.MS-PS1-1

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

• -25

• +25

• +30

• -30

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

• 106 protons 72 neutrons 106 electrons

• 72 protons 106 neutrons 72 electrons

Tags

NGSS.MS-PS1-1

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

• 18

• 19

• 20

• 39

Which statement would accuratly describe an atom of tin?

• 50 protons

• 118 neutrons

• 137 protons

• 85 electrons

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5