why do atmoic numbers increase from left to right across any given row of the periodic table

if movement of particles slows down (solid) does the attraction between particles decrease or increase?

A fixed amount of gas in a rigid container is heated from 300 k to 900 k, which of the following responses best describes what will happen a. increase in pressure by factor greater than3 b. pressure remains the same c.

What number of Fe atoms and what amount if miles of Fe atoms are in 500 g of iron?

What is the element with the symbol Ba?

Given: 2H2O2 → 2H2O + O2 structure of H2O2: H-O-O-H Bond Bond Energy (kJ/mol) O-H 459 O=O 494 O-O 142 Based on the given bond energies, what is the enthalpy change for the chemical reaction? A. - 352 kJ B. - 210 kJ C. - 176 kJ D. - 105 kJ

Cocaine and amphetamines are both classified as

What is the formula for aluminum sulfate?

What is the chemical formula for calcium carbonate

Which statement applies to electronegativity? electronegativity increases as the size of atom increases. electronegativity decreases as the size of atom decreases. there is no correlation between electronegativity and atom size.

Give the empirical formula of a compound that contains 77.735 % c, 7.471 % h, and 14.794 % o.