Question

#1: How are the elements arranged in the modern periodic table?

A. by increasing atomic mass

B. by decreasing atomic mass

C. by increasing atomic number

D. by decreasing atomic number
***My answer: A. increasing atomic mass

is that right?

Answer 1

@MandyMicheala :)

Answer 2

Just a sec. :)

Answer 3

The Periodic Law.

Answer 4

#2: Why didn't Mendeleev include helium, neon, and argon in his periodic table?

A. These elements did not fit in with his pattern.

B. These elements are gases and he didn't include gases.

C. The atoms of these elements had no atomic mass.

D. These elements had not yet been discovered.

***idk.. either A or C?? what do u think?

Answer 5

kk

Answer 6

What's #2?

Answer 7

do u undersatnd these quetsions?