Which of the following is always true about radioisotopes?

A) They have unstable nuclei.

B) Their neutron-to-proton ratio is 1:1.

C) Their decay products are stable isotopes.

D) all of the above

The answer is A, I just passed my test.

How is the combined gas law modified to form the ideal gas law?

Which is the correct Lewis structure for hydrogen peroxide, H2O2

A brick measures 25cm by 12 cm by 13 cm. What is the volume of the brick in cm3? How many milliliters of water would this brick displace?

What is the molarity of a kcl solution made by diluting 75.0 ml of a 0.200 m solution to a final volume of 100. ml?

In which sample is the average kinetic energy of the particles greatest? (1) 10. mL of HCl (aq) at 25°C (2) 15 mL of HCl (aq) at 20.°C (3) 10. mL of H2O (l) at 35°C (4) 15 mL of H2O (l) at 30.°C

List two non-SI units for volume, and explain how they relate to the cubic centimeter.

G which atomic orbitals overlap to form the carbon-carbon σ bonding molecular orbital of acetylene, c2h2?

Where did the earth hold most of its original water

Giovanni created this chart to study for an exam. A 2-column table titled common ionic compounds. The first column labeled compound has entries sodium hydroxide (N a O H), iron oxide (F e O), calcium chloride (C a C l subscript 2), calcium carbonate

Consider the two electron arrangements for neutral atoms A and B. What is the difference between atom A and atom B? A - 1s22s22p63s1 B - 1s22s22p65s1 Atom B has lost some inner electrons.