How many protons, neutrons and electrons are present in an atom of hafnium, hf, with a mass number of 178?

The lighter elements of Group I and II have distinctly different chemistry from their heavier congeners. For example, Be and Li both have a strong tendency to form polymer-like structures with bridging atoms whereas the heavier elements do not.

Câu 1: Trong phân tử este (X) no, đơn chức, mạch hở có thành phần oxi chiếm 36,36 % khối lượng. Số đồng phân bố tạo của X là A. 4. B. 5. C. 2. D. 3.

What color would a bromocresol green solution be at ph=7?

Find the total mass of three diamonds that have masses of 14.2 grams, 8.73 grams, and 0.912 gram. A. 24 g B. 23.84 g C. 23.8 g D. 23.842 g

In the reaction of calcium with chlorine which atom is the oxidizing agent

What is carbon fixation, and how does it relate to photosynthesis? It is the absorption of CO2 from the air;, and it occurs during the light-dependent reactions. It is the reduction of CO2, and it occurs during the Calvin cycle.

What is a Boitic factor

What would the partial pressure of water vapor be if you included this gas in the problem and it gave a total of 1.03atm? 0.01 atm 0.03 atm 1.03 atm

Define a balance equations:

What is the best description of the Bohr model of the atom? The atom consists of a positively charged material with negatively charged electrons embedded within it. The atom consists of a nucleus with electrons orbiting randomly around it.