What is the mass percent of sodium in NaCl?

a) 39.34%

b) 60.66%

c) 60.66%

d) 78.68%

Which two elements have the most similar chemical properties? (1) Be and Mg (3) Cl and Ar (2) Ca and Br (4) Na and P

Which electron configurations represent the first two elements in Group 17 (7A) of the Periodic Table? A 1s22s1 and 1s22s2 B 1s22s22p6 and [Ne]3s23p5 C 1s22s22p5 and [Ne]3s23p5 D 1s22s2 and 1s22s22p1

How to calculate the energy absorbed by ice melting

What is the maximum number of electrons in the first electron shell, closest to the nucleus? a. 1 b. 2 c. 4 d. 8

For which of the following molecular formulas is the formula shown in parentheses the correct empirical formula? (a) C12H22O11 (C12H22O11), (b) C8H12O4 (C4H6O2), (c) H2O2 (H2O) ?

Determine an empirical formula from each set of percent composition data. 1. 18.27% K, 59.30% I, 22.43% 0

What are the controlled, independent, and dependent variables of this experiment? The experiment is to drop 2 drops of food coloring in one glass of hot water, and one of cold water to see which has the faster rate of diffusion.

Aluminum foil used for storing food weighs about 0.3 g per square inch. How many atoms of aluminum are contained in one square inch of the foil?

Sulfur reacts with oxygen to form sulfur dioxide (SO2 (g), Hf = - 296.8 kJ/mol) according to the equation below. What is the enthalpy change for the reaction? Use

Comparing the mass of the nucleus with the mass of the protons and the mass of the neutrons refers to what? Einstein's theory of relativity nuclear binding energy the weak force the strong force mass defect