Why are elements within the same group on the periodic table are considered family members

In Dobereiner's classification system, the atomic mass of the middle element could be estimated by A. finding the difference between the atomic masses of the other two elements in a triad B.

Write a chemical equation for nh4 + (aq) showing how it is an acid or a base according to the arrhenius definition.

Earth's magnetic field: 1) does not affect solar winds 2) is not affected by solar winds 3) protects Earth from radiations 4) creates gravitational forces

Calculate the lattice energy for NaF (s) given the following sublimation of energy + 109 kj/mol Hf for F (g) + 77 kj/mol first ionization energy of Na (g) + 495 electron affinity of F (g) - 328 enthalpy of formation of NaF (s) - 570 kj/mol A.

Skunks eat fruits, worms, plants, fish, insects, and more. Which describes the role of a skunk? A. autotrophic omnivore B. heterotrophic omnivore C. autotrophic carnivore D. heterotrophic carnivore

A rope experiences three 400 N forces to the left and three different 410 N forces to the right. (A) Will accelerate to the left (B) Will accelerate to the right (C) Will not accelerate

An ionic bond involves the transfer of what? * Olons Protons Electrons Neutrons

During an Experiment a scientist notes that a sample turned red. which kind of data did the scientist record A. average data B. quantitative data C. measured data D. qualitative data

Why is chemistry important for the study of living things

How much does radon cost per gram