If an element has 7 electrons how many will be in the 2nd energetic level

The atomic mass of potassium is 39. if its atomic number is 9, it has how many neutrons within each potassium atom?

Solar winds have an influence all the way to about 160 AU from the Sun. About how many kilometers is that? A. 24,000,000,000 km B. 48,000,000,000 km C. 240,000,000,000 km D. 480,000,000,000 km

You've been asked to teach a group of fifth-grade students about the electromagnetic spectrum. In your own words, how would you explain the electromagnetic spectrum?

Three resistors, of 100, 200, and 300 ohms are connected in parallel. What is their equivalent resistance? (Unit = ohms)

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen? A. 2 in front of water and 2 in front of oxygen B.

Which are the most common producers in aquatic ecosystems? a - bacteria b - algae c - fish d - plants

You push a piano 5 meters across the floor with a force of 400 n. how much work have you done?

Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude.

The measure of the force of gravity on an object, expressed as mass of the object times acceleration due to gravity is called

Which of the following jobs does not require good swimming ability