Question

1. read the article linked in google classroom. write 1-2 sentences summarizing the main idea for each paragraph of your reading.

paragraph #1
the atomic number is equal to the number of protons and electrons in a neutral atom. neutral atoms are atoms with no overall charge or a net charge of zero. the chemical symbol is one or two letters used to represent the latin or english name of the element. the element name is the common name for the element.

paragraph #2
the period number indicates the number of energy levels in an atom. energy levels are distinct regions around the nucleus of an atom where electrons are found. as you move down the periodic table the number levels in an atom increases.

paragraph #3
the group number indicates the number of valence electrons in an atoms outermost energy level or valence energy level.

1. determine if each statement is true or false.

neutral atoms are atoms with no overall charge.
elements in the same group have the same number of valence electrons.
semimetals are extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.
the atomic number can change without changing the type of element.
as you move across a period, the number of valence electrons increases by one.

Explanation:

Statement 1:

Neutral atoms have equal protons and electrons. So, no overall charge.

Statement 2:

Group number = valence electrons (for main - group elements).

Statement 3:

Noble gases (not semimetals) are extremely stable. Semimetals have properties between metals and non - metals.

Statement 4:

Atomic number defines the element. Change atomic number → new element.

Statement 5:

Across a period (left - to - right), valence electrons increase by one.

Answer:

True, True, False, False, True