Which of the following elements belong to the d-block of the periodic table?

Question 2 options:

transition metals

noble gases

halogens

alkali metals

What's the name of a molucule composed of two identical atoms

Is eating a piece of candy physical change, chemical change, or both?

Isomers have the same physical properties because the chemical formulas are identical. True False

The "hardness" of water is usually expressed as parts per million (ppm) by mass of caco3. what is the molar concentration of ca+2 ions in a water sample with a hardness count of 175 ppm?

Why will an element that is brittle lacks luster and has 6 valence electrons be in group 16

Compare the hydronium ion concentration of the solution having a ph of 2.0

Look at the following chemical formula. How many total elements and total atoms are present in the formula? 2NaHCO3

How many covalent bonds does hydrogen have

What type (s) of orbital overlap is (are) indicated on the left most carbon of allene, which is shown below? h2c=c=ch2?

Give one part of daltons atomic theory that is no longer excepted and explain why