A neutral atom has 12 protons and 13 neutrons in its nucleus. What is its mass number?

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Drag each number to the correct location on the equation. each number can be used more than once, but not all numbers will be used. balance the equation with the coefficients. 2 3 4 5 kclo3 -> kcl + o2

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o