Different elements must have different numbers of what a. all particles b. protons c. electrons d. neutrons

Compare the data on the atomic radius graph for elements 3 through 10 with the data for elements 11 through 13. a. How are they similar? b. How are they different?

Naturally occurring iron contains: 5.82% 54Fe (atomic mass = 53.940 amu) 91.66 % 56Fe (atomic mass = 55.935 amu) 2.19% 57Fe (atomic mass = 56.935 amu) 0.33% 58Fe (atomic mass = 57.933 amu) Calculate the average atomic mass of iron.

What distinguishes a fungi from a plant? contains a different type of photosynthetic pigment than plants does not contain the photosynthetic pigment chlorophyll no root type structures cannot obtain materials from soil

An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located? 1. 5 2. 2 3. 3 4. 4

How many hydrogen atoms are there in 5 molecules of CH2Cl2?

What is the best category for nf3? 1. amphoteric ion 2. lewis acid 3. salt 4. bronsted-lowry acid 5. arrhenius acid 6. arrhenius base 7. lewis base 8. weak electrolyte?

100 g = ___hg for science

A real gas behaves more like an ideal gas when the gas molecules are

How many moles are in 12.5 g of H2O

Substance which allows energy to pass through it