New Matter and Energy

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

This particle determines what element you have - the elements identity.

• electron
• proton
• neutron
• valence shell

Which particles make up the nucleus of an atom?

• protons and neutrons
• electrons and protons
• electrons, protons, and neutrons
• electrons and neutrons

Tags

NGSS.MS-PS1-1

What charge does the nucleus have and why?

• positive - the neutrons do not have a charge
• positive - the neutrons and protons are positively charged particles
• neutral - the neutral charge dominates the positive charge
• neutral - electrons cancel out the positive charge of the atom

All atoms with more than one energy level are NOT REACTIVE have how many electrons in their valence shell?

• 1

• 2

• 8

• 16

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity? (8.5B)

• The number of protons

• The number of neutrons

• The location of valence electrons

• The number of valence electrons

Valence electrons determine (8.5B):

• The color of an element

• The atomic mass of an element

• How an element reacts with other elements

• The identity of the element

An atom has a mass number of 36 and an atomic number of 16, how many neutrons does the atom have?

• 36
• 20
• 16
• 6

Using your periodic table, what element is in the third period and group 5A (15)?

• Fe
• P
• Al
• B

Elements in the same __________ will have similar chemical properties.

• Group
• Period