1 Chemistry -Atoms

They are the electrons in the outermost shell of an atom

• Valence electrons

• strayed electrons

• balance electrons

Tags

NGSS.MS-PS1-1

What are valence electrons and where are they located in an atom?

• Valence electrons are located in the outermost energy level or shell of an atom.

• Valence electrons are located in the protons of an atom.

• Valence electrons are located in the innermost energy level or shell of an atom.

• Valence electrons are located in the nucleus of an atom.

What is represented by the letters found on each box of the Periodic Table?

• Atomic Number

• Density

• Chemical Symbol

• Mass Number

What is represented by the numbers found on each box of the Periodic Table?

• Atomic Number

• Density

• Chemical Symbol

• Mass Number

An atomic number is the number of protons in the nucleus of an atom

• True

• False

An atomic number is also the number of electrons in a neutral atom of that element.

• True

• False

When an atom has an equal number of protons and electrons, it is said to be

• neutral

• positively charged

• negatively charged

When an atom loses an electron, it becomes a

• neutral

• positively charged ion

• negatively charged

When an atom gains an electron, it becomes a

• neutral

• positively charged ion

• negatively charged ion

a form of a chemical element that has the same number of protons in its nucleus but a different number of neutrons.

• isotope

• ion