atomic structure

The number of protons in an element can be found by:

• looking up the group the element is in.
• subtracting the atomic mass from atomic number
• looking up the atomic mass
• looking up the atomic number

Which particles are in the nucleus?

• Protons
• Neutrons
• protons and electrons
• protons and neutrons

Tags

NGSS.MS-PS1-1

How do you calculate the charge of an atom?

• protons - electrons = charge
• protons - neutrons = charge
• its equal to the number of electrons = charge
• protons = charge

Tags

NGSS.HS-PS1-7

How do you determine the number of  valence electrons the main group elements have when neutral?

• Corresponds to the period
• Corresponds to the group
• Corresponds to the block

Tags

NGSS.HS-PS1-1

Cations (like Ca²⁺)gain a positive charge by ____ electrons accoring to the octet rule.

• gaining
• losing

Anions (like Cl^-) gain a negative charge by ____ electrons according to the octet rule.

• gaining
• losing

What charge would a sulfur atom have if it became an anion?

• S^2-
• Na^2-
• S²⁺
• Na²⁺

What is always different about 2 isotopes of the same element?

• Their number of protons
• Their number of electrons
• Their number of Neutrons
• Their reactivity

The valence electrons are the outermost electrons which determine an elements ________.

• mass
• kinetic energy
• reactivity
• half-life

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What would the ionic charge of a magnesium ion be?

• Mg²⁺
• Mg⁺
• Mg^2-
• Mg^-