An elements atomic number is 57. How many protons would an atom of this element have?

Hydrogen reacts with an element to form a compound. Which element would have the most electrons available to react with hydrogen? a. oxygen b. chlorine c. neon d. nitrogen

About 300 B. C., Aristarchus suggested that the sun was at the center of the universe. Why? The brightness of the planets would change. The planets appeared to move among the constellations. The planets always moved opposite to the stars.

Lead (II) sulfate is precipitated from a mixture of water solutions of potassium sulfate and lead (II) nitrate. Write the word equation and balanced chemical equation for this double replacement reaction.

How does a chiken eat

Using the given table of electronegativity values, determine whether each bond is nonpolar covalent, polar covalent, or ionic. Table: 1st column: Element (F, O, Cl, Br, I, S) 2nd Column: Electronegativity (4.0, 3.5, 3.0, 2.9, 2.7, 2.

Atoms whose outermost energy level is not filled may gain or lose valence electrons. What do you call these atoms?

Which group 7 element has the most least for electrons

How are elements organized in the periodic table

What is the molarity of solution prepared by dissolving 11.75 g of KNO3 in enough water to produce 2.00 L of solution?

1. Calculate the wavelength (in nm) of the red light emitted by a barcode scanner that has a frequency of 4.62 x 1014 5-1. 649.4 nm