Why is fluorine-18 unstable? Fluorine-18 Of the unstable nuclides of fluorine, 18F has the longest half-life, 109.739 minutes. It has two decay modes, of which the main one is positron emission. For this reason 18F is a commercially important source of positrons. Like all positron-emitting radioisotopes, 18F also may decay by electron capture. Why is […]
What are safety symbols?
What are safety symbols? Safety symbols, hazard symbols or safety labels are meaningful and recognizable graphical symbols that warn of or identify hazards associated with the location or item. What Colour is safety signs? Health and Safety (Safety Signs and Signals Regulations) 1996 Type Shape Colour WARNING SIGNS These signs give warning of potential risks […]
Why does it occur when the brakes are applied suddenly?
Why does it occur when the brakes are applied suddenly? Answer: It is due to inertia of motion. When the driver of a fast moving car suddenly applies brakes the passengers in the car? When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained […]
Which country uses the most water per person?
Which country uses the most water per person? Global water withdrawals per capita as of 2018, by select country (in cubic meters) Per capita water consumption in cubic meters United States (2015) 1,206.82 Greece (2018) 962.04 Canada (2015) 855.26 Turkey (2018) 741.97 Which country wastes the least water? Water riches, water poverty The countries where […]
What is a metaphor for happiness?
What is a metaphor for happiness? For instance, according to Kovecses (1991), there are many conceptual metaphors for happiness in English but three of them have been recognized as major metaphors: HAPPINESS IS UP ‘I’m feeling up’, ‘I’m walking on air’, HAPPINESS IS LIGHT ‘She brightened up’, HAPPINESS IS A FLUID IN A CONTAINER ‘He’s […]
Why is Group 15 called nitrogen?
Why is Group 15 called nitrogen? The Group 15 elements are generally known as the nitrogen family. All of the elements of this family have five electrons in their outermost energy level. This group is divided into nonmetals, semimetals, and metals by characteristic. Nitrogen is a diatomic gas and phosphorus is a solid. Why is […]
How much aspirin does it take to unclog arteries?
Which magnitude star is brightest?
Which magnitude star is brightest? 1st magnitude Why does the rotational axis of Earth precess quizlet? Why does the rotational axis of Earth precess? The Sun and Moon pull on Earth’s equatorial bulge. Where can we see the pole star? The North Star or Pole Star – aka Polaris – is famous for holding nearly […]
Which one is more stable O or O 2?
Which one is more stable O or O 2? 1 Answer. O2+ is more stable than O2-. Because According to molecular orbital theory O2+ has 15 electrons &it has one electron in antibonding orbital. In the case of O2- 17 electrons are present &3 electrons are present in antibonding orbitals. Why O2 ion is more […]