Which of the elements has the highest electronegativity? (A) F (B) P (C) LI (D) CI

Carbon-14 emits beta radiation and decays with a half-life (t) of 5730 years. Assume that you start with a mass of 6000 g of carbon 14. How many grams of the isotope remains at the end of four half-lives?

The electronic configuration of an element is given below. Element 1: 1s22s22p4 Which statement about the reactivity of the element is true? A. It is reactive because it has to gain an electron to have a full outermost energy level. B.

Which of the following is a decomposition reaction? A. 2Mg+O2 - > 2MgO B. CH4+2O2 - > CO2+H2 C. 2H2O + 2Na - > 2NaOH+H2 D. CaCO3 - >CaO+CO2

A persons blood plasma is free of any anti-bodies which would cause red blood cells to clump this person has what blood type

Ta shell can hold a maximum of 32 electrons, what is the value of n?

A non-metallic atom (at. no. 9) forms a molecule of the same, containing a single covalent bond. give reason

What is Nitroglycerin in Science?

An acid (X) reacts with a base (Y) to produce Mg3 (PO4) 2. What are X and Y? X = H3PO3; Y = Mg (OH) 2 X = H3PO4; Y = Mg (OH) 2 X = H3PO4; Y = Ca (OH) 2 X = H3PO3; Y = Ca (OH) 2

What are the pros of using steel?

The atomic mass of chlorine is listed as 35.454 amu on the periodic table. It has two naturally occurring isotopes, Cl-35 and Cl-37. What are the approximate percentages of each?