If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of this element?

A. atomic mass, 99 amu; radon
B. atomic mass, 99 amu; technetium
C. atomic mass, 137 amu; barium
D. atomic mass 142 amu; einsteinium


Answer: B

Environmental & Atmospheric Sciences

You might also like to view...

The most massive part of Earth's climate system belongs to the ________

A) atmosphere B) biosphere C) cryosphere D) geosphere E) hydrosphere

Environmental & Atmospheric Sciences

Family size is large in much of Sub-Saharan Africa because of the high rate of urbanization

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The Sun and the rest of the solar system formed about 5 billion years ago from a huge cloud of dust and gas called a ________

A) nebula B) solar system C) protoplanet D) quasar E) supernova

Environmental & Atmospheric Sciences

Coral reefs cover less than ________ of the ocean's surface area but they are home to ________ of all marine species

A) 0.5%; 25% B) 1.0%; 25% C) 0.5%; 33% D) 1.0%; 33% E) 1.0%; 50%

Environmental & Atmospheric Sciences