Use the periodic to fill in the numbers in the electron configurations shown below. B: 1s2 2sA2pB

A =

B =

1) Which type of radioactive emission has a positive charge and weak penetrating power? A) alpha particle B) beta particle C) gamma ray D) neutron

A blacksmith making a tool heats 525 grams of steel to 1230C. After hammering the steel, she places it into a bucket of water to cool it. When she removes the steel from the water, it's a 50C.

In the preindustrial era, settlements were more likely to be near sources of surface water than in the industrial era.

List 2 potential negative impacts that extraction of gold has on the environment?

Which of the following pairs of elements is/are likely to form an ionic bond? Choose one or more: A. Na and F B. Ca and Cl C. H and H D. Cl and Br E. K and I F. N and C

What happens when a firework is ignited?

The spines and thick wavy cuticle on a cactus are both what

What type of chemical process is used to create perfume?

Which of the following is a polyatomic ion? O A. HCI O B. Na O C. PO, O D. 52

What are the cations and anions for V2 (CO3) 3