What determines the length of each period in the periodic table?

Brock brings a magnet near a metal object. a magnetic force acts on an object, pulling it upward. which of the following best describes the magnetic force?

A stable atom that has a large nucleus most likely contains ... ? A.) more neutrons than protons B.) more protons than neutrons. C.) equal numbers of protons and neutrons. D.) changing numbers of protons and neutrons.

Write the chemical reaction for nitrous acid in water, whose equilibrium constant is K a. Include the physical states for each species. K a reaction: Write the chemical reaction for the nitrite ion in water, whose equilibrium constant is K b.

A 7th grade science class placed three large grade A eggs into beakers and recorded the mass. They then filled one beaker with vinegar, one with corn syrup, and one with distilled water. After 5 days, they recorded the new masses of the eggs.

Element+element examples

What is a neutron and what charge does it have

Examples of mechanical and physical weathering in our neighborhoods

Balance the redox reaction KMNO4 + NH3 - --> KNO3 + MNO2 + KOH + H2O

A representation that shows the distribution of geologic features in a given area

The process of evaporation describes which of the following changes of state? solid ➡ liquid gas ➡ solid liquid ➡ gas solid ➡ gas