Using the periodic table is the elements how many valence electrons would helium have

A biologist determines that a lizard's body temperature is 29 degrees C. Which of the following correctly describes the biologist's data?

Write a chemical equation for HCl (aq) showing how it is an acid or a base according to the Arrhenius definition. Express your answer as a chemical equation. Identify all of the phases in your answer.

All the food chains in an ecosystem that are connected together form a?

How do the number of valence electrons an element has change from column to column?

Why does water have unique characteristics compared to other similar molecules

Which is a sign of a chemical change? Question 6 options: Paint on a freshly painted wall dries and is no longer sticky. Ice cream melts when left at room temperature. Vinegar is mixed with baking soda resulting in carbon dioxide bubbles.

What is the correct term for water Atom element product reactant

Do carbon atoms gain, lose, or share electrons?

In aqueous solution the ag ion forms a complex with two ammonia molecules. Write the formation constant expression for the equilibrium between the hydrated metal ion and the aqueous complex.

Which samples are substance? (A) HCI (aq) (B) NaCI (aq) (C) HCI (g) (D) NaCI (s)