Question

part a: multiple choice

1. who is credited with creating the first widely recognized periodic table?

a. isaac newton
b. john dalton
c. dmitri mendeleev
d. marie curie

1. what is the horizontal row in the periodic table called?

a. group
b. period
c. family
d. block

1. elements in the same group have:

a. the same atomic number
b. the same number of electron shells
c. similar chemical properties
d. different physical states

1. which of the following is a noble gas?

a. oxygen
b. neon
c. nitrogen
d. chlorine

Explanation:

1. Dmitri Mendeleev is credited with creating the first widely - recognized periodic table. He arranged elements based on their atomic masses and properties.
2. The horizontal rows in the periodic table are called periods. Each period represents a new energy level being filled with electrons.
3. Elements in the same group have similar chemical properties because they have the same number of valence electrons.
4. Neon is a noble gas. Noble gases have a full outer electron shell, making them very stable and unreactive.

Answer:

1. C. Dmitri Mendeleev
2. B. Period
3. C. Similar chemical properties
4. B. Neon