In the periodic table, how are elements in the same group related to each other? a. they have the same atomic mass. b. they have very different properties. c. they have the same atomic number. d. they have very similar properties.

D. They have very similar properties.

Explanation:

A. They have the same atomic mass.

 ⇒ This is false, every element has a different atomic mass.

B. They have very different properties

 ⇒ This is false. elements in the same group have similar properties

C. They have the same atomic number.

⇒ Every element has a unique and different atomic number

D. They have very similar properties.

 ⇒ This is correct. Elements in the same group usually have similar properties, because they have the same number of electrons in the outermost electron shell.

i'm not sure

explanation:

i'll try whatever you got

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.