The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element?

Atom Atomic number Mass number

a 100 257

b 101 257

c 101 260

d 102 259

A.) A and B

B.) B and C

C.) B and D

D.) C and D

What is the percent s character in an sp? hybridized orbital? 25% 33% 50% 67% 75%

Which statement best describes the trend in atomic radii observed in the periodic table? 1. The atomic radii increase, moving across a period to the right and up in a group. 2.

If 80 grams of Al and 80 grams of Fe2 O3 are combined, what is the maxium number of moles of fe that can be produced?

Infer why life is unlikely on the outer planets in spite of the presence of water, methane, and ammonia materials needed for life to develop.

The table compares the characteristics of a substance in three different states of matter. Comparison of Characteristics Characteristic State X State Y State Z Average Kinetic Energy of the Molecules Low Greatest Least Particle Attraction/Forces

What is the oxidation number of chromium in the ionic compound ammonium dichromate (nh4) 2cr2o7?

Draw an ecosystem with 10 biotic and 5 abiotic factor

Which organism is responsible for cleanup in this ecosystem? coyote vulture prairie dog grasshopper or prairie grass

What would happen if you tried to sqeeze a gas into a smaller container?

Paint, paint thinners and some cleaning agents can weaken the shell of a hard hat and may eliminate